diff --git a/src/api/im/manager/statistics/index.ts b/src/api/im/manager/statistics/index.ts
index 10d10fe5e..360e96afd 100644
--- a/src/api/im/manager/statistics/index.ts
+++ b/src/api/im/manager/statistics/index.ts
@@ -20,7 +20,7 @@ export interface ImStatisticsTrendVO {
 }
 
 export interface ImStatisticsMessageTypeVO {
-  type: number // 参见 ImMessageTypeEnum 枚举类，由前端按 DICT_TYPE.IM_MESSAGE_TYPE 翻译
+  type: number // 参见 ImContentTypeEnum 枚举类，由前端按 DICT_TYPE.IM_CONTENT_TYPE 翻译
   value: number
 }
 
@@ -50,7 +50,7 @@ export const getUserTrend = (days: number): Promise<ImStatisticsTrendVO> => {
   return request.get<ImStatisticsTrendVO>({ url: '/im/manager/statistics/user-trend', params: { days } })
 }
 
-// 获得消息类型分布（最近 30 天）
+// 获得内容类型分布（最近 30 天）
 export const getMessageTypeDistribution = (): Promise<ImStatisticsMessageTypeVO[]> => {
   return request.get<ImStatisticsMessageTypeVO[]>({
     url: '/im/manager/statistics/message-type-distribution'
diff --git a/src/api/im/message/group/index.ts b/src/api/im/message/group/index.ts
index e8988e588..7bb4523a2 100644
--- a/src/api/im/message/group/index.ts
+++ b/src/api/im/message/group/index.ts
@@ -6,7 +6,7 @@ export interface ImGroupMessageRespVO {
   clientMessageId: string // 客户端消息编号
   senderId: number // 发送人编号
   groupId: number // 群编号
-  type: number // 消息类型
+  type: number // 内容类型
   content: string // 消息内容（JSON 格式）
   status: number // 消息状态
   sendTime: string // 发送时间
@@ -20,7 +20,7 @@ export interface ImGroupMessageRespVO {
 export interface ImGroupMessageSendReqVO {
   clientMessageId: string // 客户端消息编号
   groupId: number // 群编号
-  type: number // 消息类型
+  type: number // 内容类型
   content: string // 消息内容（JSON 格式）
   atUserIds?: number[] // @ 目标用户编号列表
   receipt?: boolean // 是否需要回执
diff --git a/src/api/im/message/private/index.ts b/src/api/im/message/private/index.ts
index 376347e0b..3c5bf16aa 100644
--- a/src/api/im/message/private/index.ts
+++ b/src/api/im/message/private/index.ts
@@ -6,7 +6,7 @@ export interface ImPrivateMessageRespVO {
   clientMessageId: string // 客户端消息编号
   senderId: number // 发送人编号
   receiverId: number // 接收人编号
-  type: number // 消息类型
+  type: number // 内容类型
   content: string // 消息内容（JSON 格式）
   status: number // 消息状态（正常 / 已撤回）
   receiptStatus?: number // 回执状态（不需要 / 待完成 / 已完成），对齐 ImMessageReceiptStatus
@@ -17,7 +17,7 @@ export interface ImPrivateMessageRespVO {
 export interface ImPrivateMessageSendReqVO {
   clientMessageId: string // 客户端消息编号
   receiverId: number // 接收人编号
-  type: number // 消息类型
+  type: number // 内容类型
   content: string // 消息内容（JSON 格式）
   receipt?: boolean // 是否需要回执；不传后端默认 true（普通私聊用户消息）
 }
diff --git a/src/utils/dict.ts b/src/utils/dict.ts
index cd82beaa1..f8032db94 100644
--- a/src/utils/dict.ts
+++ b/src/utils/dict.ts
@@ -328,7 +328,7 @@ export enum DICT_TYPE {
   MES_WM_PACKAGE_STATUS = 'mes_wm_package_status', // MES 装箱单状态
 
   // ========== IM - 即时通讯模块  ==========
-  IM_MESSAGE_TYPE = 'im_message_type', // IM 消息类型
+  IM_CONTENT_TYPE = 'im_content_type', // IM 内容类型
   IM_MESSAGE_STATUS = 'im_message_status', // IM 消息状态：0=正常 / 2=已撤回（私聊 / 群聊共用）
   IM_MESSAGE_RECEIPT_STATUS = 'im_message_receipt_status', // IM 消息回执状态：0=不需要 / 1=待完成 / 2=已完成
   IM_FRIEND_STATUS = 'im_friend_status', // IM 好友状态
diff --git a/src/views/im/home/components/user/RecommendCardDialog.vue b/src/views/im/home/components/user/RecommendCardDialog.vue
index abdc04fea..95a5ef24b 100644
--- a/src/views/im/home/components/user/RecommendCardDialog.vue
+++ b/src/views/im/home/components/user/RecommendCardDialog.vue
@@ -115,7 +115,7 @@ import { useConversationStore } from '../../store/conversationStore'
 import { useFriendStore } from '../../store/friendStore'
 import { useGroupStore } from '../../store/groupStore'
 import { useMessageSender } from '../../composables/useMessageSender'
-import { ImConversationType, ImMessageType, isGroupConversation } from '../../../utils/constants'
+import { ImConversationType, ImContentType, isGroupConversation } from '../../../utils/constants'
 import { getConversationKey } from '../../../utils/conversation'
 import { buildDefaultGroupName } from '../../../utils/group'
 import { serializeMessage, type CardTarget } from '../../../utils/message'
@@ -221,7 +221,7 @@ async function handleSend() {
   sending.value = true
   try {
     const tasks = targets.map(async (conversation) => {
-      const cardOk = await sendRaw(ImMessageType.CARD, cardContent, { conversation })
+      const cardOk = await sendRaw(ImContentType.CARD, cardContent, { conversation })
       if (!cardOk) {
         return { conversation, ok: false }
       }
@@ -289,7 +289,7 @@ async function handleCreateGroupAndSend() {
       lastContent: '',
       lastSendTime: 0
     }
-    const cardOk = await sendRaw(ImMessageType.CARD, serializeMessage({ ...card }), {
+    const cardOk = await sendRaw(ImContentType.CARD, serializeMessage({ ...card }), {
       conversation: newConversation
     })
     if (!cardOk) {
diff --git a/src/views/im/home/composables/useMediaUploader.ts b/src/views/im/home/composables/useMediaUploader.ts
index cac807995..7c55c3823 100644
--- a/src/views/im/home/composables/useMediaUploader.ts
+++ b/src/views/im/home/composables/useMediaUploader.ts
@@ -7,7 +7,7 @@ import { useConversationStore } from '../store/conversationStore'
 import { useMessageStore } from '../store/messageStore'
 import { useMessageSender } from './useMessageSender'
 import { useMuteOverlay } from './useMuteOverlay'
-import { ImMessageStatus, ImMessageType } from '../../utils/constants'
+import { ImMessageStatus, ImContentType } from '../../utils/constants'
 import {
   MESSAGE_FILE_MAX_MB,
   MESSAGE_IMAGE_MAX_MB,
@@ -56,17 +56,17 @@ export interface MediaTypeHandler {
 
 /** 媒体类型注册表：image / file / voice / video 各自的 kind + 首发 / 重传共用的 build / extract */
 export const mediaTypeHandlers: Partial<Record<number, MediaTypeHandler>> = {
-  [ImMessageType.IMAGE]: {
+  [ImContentType.IMAGE]: {
     kind: '图片',
     build: (_file, url) => ({ url }) as ImageMessage,
     extractResendContext: () => ({})
   },
-  [ImMessageType.FILE]: {
+  [ImContentType.FILE]: {
     kind: '文件',
     build: (file, url) => ({ url, name: file.name, size: file.size }) as FileMessage,
     extractResendContext: () => ({})
   },
-  [ImMessageType.VOICE]: {
+  [ImContentType.VOICE]: {
     kind: '语音',
     build: (_file, url, context) => ({ url, duration: context.voiceDuration ?? 0 }) as AudioMessage,
     extractResendContext: (oldContent) => {
@@ -74,7 +74,7 @@ export const mediaTypeHandlers: Partial<Record<number, MediaTypeHandler>> = {
       return { voiceDuration: old?.duration ?? 0 }
     }
   },
-  [ImMessageType.VIDEO]: {
+  [ImContentType.VIDEO]: {
     kind: '视频',
     build: (file, url, context) =>
       ({
@@ -101,7 +101,7 @@ export const mediaTypeHandlers: Partial<Record<number, MediaTypeHandler>> = {
 /** 单次媒体上传的入参（image / file / voice 走 uploadAndSendMedia；video 走低层 helper 自行组装） */
 export interface UploadAndSendMediaOptions {
   file: File
-  /** 对齐 ImMessageType；mediaTypeHandlers 必须有对应项 */
+  /** 对齐 ImContentType；mediaTypeHandlers 必须有对应项 */
   type: number
   /** 媒体特定的元数据（如语音时长 / 视频元信息）；不传按空对象处理 */
   context?: MediaTypeContext
@@ -124,23 +124,23 @@ export interface UploadAndSendMediaOptions {
  *
  * 任意失败把消息状态置 FAILED；MessageItem 上点重试再走一次本函数（_localFile 还在内存就行）
  */
-/** 按消息类型映射体积上限（MB）；未识别类型返回 0 表示不限 */
+/** 按内容类型映射体积上限（MB）；未识别类型返回 0 表示不限 */
 function resolveMediaMaxMb(type: number): number {
   switch (type) {
-    case ImMessageType.IMAGE:
+    case ImContentType.IMAGE:
       return MESSAGE_IMAGE_MAX_MB
-    case ImMessageType.VIDEO:
+    case ImContentType.VIDEO:
       return MESSAGE_VIDEO_MAX_MB
-    case ImMessageType.VOICE:
+    case ImContentType.VOICE:
       return MESSAGE_VOICE_MAX_MB
-    case ImMessageType.FILE:
+    case ImContentType.FILE:
       return MESSAGE_FILE_MAX_MB
     default:
       return 0
   }
 }
 
-/** 校验媒体文件大小是否超过消息类型上限；超限触发 warn 并返回 false，调用方不应进入占位 / 上传链路 */
+/** 校验媒体文件大小是否超过内容类型上限；超限触发 warn 并返回 false，调用方不应进入占位 / 上传链路 */
 export function ensureMediaSizeWithinLimit(
   file: File,
   type: number,
diff --git a/src/views/im/home/composables/useMessagePuller.ts b/src/views/im/home/composables/useMessagePuller.ts
index 85b778c18..a3d148462 100644
--- a/src/views/im/home/composables/useMessagePuller.ts
+++ b/src/views/im/home/composables/useMessagePuller.ts
@@ -23,7 +23,7 @@ import { pullMyConversationReadList as apiPullMyConversationReadList } from '@/a
 import {
   ImConversationType,
   ImMessageStatus,
-  ImMessageType,
+  ImContentType,
   isFriendChatTip,
   isFriendNotification
 } from '../../utils/constants'
@@ -208,7 +208,7 @@ export const useMessagePuller = () => {
           if (isPrivate) {
             const message = raw as ImPrivateMessageRespVO
             // 特殊：撤回消息的处理
-            if (message.type === ImMessageType.RECALL) {
+            if (message.type === ImContentType.RECALL) {
               pulledMessages.push({
                 kind: 'recall',
                 conversationType: ImConversationType.PRIVATE,
@@ -235,7 +235,7 @@ export const useMessagePuller = () => {
           } else {
             const message = raw as ImGroupMessageRespVO
             // 特殊：撤回消息的处理
-            if (message.type === ImMessageType.RECALL) {
+            if (message.type === ImContentType.RECALL) {
               pulledMessages.push({
                 kind: 'recall',
                 conversationType: ImConversationType.GROUP,
diff --git a/src/views/im/home/composables/useMessageSender.ts b/src/views/im/home/composables/useMessageSender.ts
index 2d5251611..820f7889b 100644
--- a/src/views/im/home/composables/useMessageSender.ts
+++ b/src/views/im/home/composables/useMessageSender.ts
@@ -19,7 +19,7 @@ import {
   type QuoteMessage,
   type TextMessage
 } from '../../utils/message'
-import { ImMessageType, ImMessageStatus, ImConversationType } from '../../utils/constants'
+import { ImContentType, ImMessageStatus, ImConversationType } from '../../utils/constants'
 import { MESSAGE_PRIVATE_READ_ENABLED, MESSAGE_GROUP_READ_ENABLED } from '../../utils/config'
 import { getClientConversationId } from '../../utils/db'
 import type { Conversation, Message } from '../types'
@@ -193,7 +193,7 @@ export const useMessageSender = () => {
       return false
     }
     const payload = withQuotePayload<TextMessage>({ content: text }, options?.quote)
-    return sendRaw(ImMessageType.TEXT, serializeMessage(payload), options)
+    return sendRaw(ImContentType.TEXT, serializeMessage(payload), options)
   }
 
   /**
diff --git a/src/views/im/home/pages/conversation/components/conversation/ConversationItem.vue b/src/views/im/home/pages/conversation/components/conversation/ConversationItem.vue
index 2ae328d5b..a31f632d5 100644
--- a/src/views/im/home/pages/conversation/components/conversation/ConversationItem.vue
+++ b/src/views/im/home/pages/conversation/components/conversation/ConversationItem.vue
@@ -107,7 +107,7 @@ import { useFriendStore } from '../../../../store/friendStore'
 import { useGroupStore } from '../../../../store/groupStore'
 import { useGroupRequestStore } from '../../../../store/groupRequestStore'
 import { useImUiStore } from '../../../../store/uiStore'
-import { ImConversationType, ImMessageType, isNormalMessage } from '../../../../../utils/constants'
+import { ImConversationType, ImContentType, isNormalMessage } from '../../../../../utils/constants'
 import { getSenderDisplayName } from '@/views/im/utils/user'
 import { buildRecallTip } from '@/views/im/utils/conversation'
 import type { Conversation } from '../../../../types'
@@ -183,7 +183,7 @@ const lastContentDisplay = computed(() => {
     return draft.value.plain
   }
   if (
-    props.conversation.lastMessageType === ImMessageType.RECALL &&
+    props.conversation.lastMessageType === ImContentType.RECALL &&
     props.conversation.lastSenderId != null
   ) {
     return buildRecallTip(
diff --git a/src/views/im/home/pages/conversation/components/input/FacePicker.vue b/src/views/im/home/pages/conversation/components/input/FacePicker.vue
index 2cee51023..5b61ad7e9 100644
--- a/src/views/im/home/pages/conversation/components/input/FacePicker.vue
+++ b/src/views/im/home/pages/conversation/components/input/FacePicker.vue
@@ -2,7 +2,7 @@
   <!--
     表情面板（多 tab）：emoji / 个人表情 / N 个系统表情包
     - 对齐微信 PC：底部 tab 栏切换面板内容；emoji 保持 Unicode（仍由 TEXT 通道发送）
-    - 个人表情 / 系统表情走 FACE 消息类型，通过 select-face 事件由调用方走 sendRaw 发送
+    - 个人表情 / 系统表情走 FACE 内容类型，通过 select-face 事件由调用方走 sendRaw 发送
     - mode='emoji' 时只显示 emoji tab + 隐藏底部 tab 栏，给留言 / 评论这类只发文本的场景用
     - 定位由调用方决定（通常浮在表情按钮上方）
   -->
diff --git a/src/views/im/home/pages/conversation/components/input/MessageInput.vue b/src/views/im/home/pages/conversation/components/input/MessageInput.vue
index 25c6ae80c..1c1e07a03 100644
--- a/src/views/im/home/pages/conversation/components/input/MessageInput.vue
+++ b/src/views/im/home/pages/conversation/components/input/MessageInput.vue
@@ -178,7 +178,7 @@ import {
 import { useMuteOverlay } from '@/views/im/home/composables/useMuteOverlay'
 import { isOpenableUrl } from '@/utils/url'
 import { getConversationKey } from '@/views/im/utils/conversation'
-import { ImConversationType, ImGroupMemberRole, ImMessageType } from '@/views/im/utils/constants'
+import { ImConversationType, ImGroupMemberRole, ImContentType } from '@/views/im/utils/constants'
 import { DANGEROUS_FILE_EXTENSIONS, MESSAGE_GROUP_READ_ENABLED } from '@/views/im/utils/config'
 import {
   serializeMessage,
@@ -616,7 +616,7 @@ async function onSelectFace(face: { url: string; width: number; height: number;
     { url: face.url, width: face.width, height: face.height, name: face.name },
     replyQuote
   )
-  await sendRaw(ImMessageType.FACE, serializeMessage(payload), { conversation })
+  await sendRaw(ImContentType.FACE, serializeMessage(payload), { conversation })
 }
 
 // ==================== @ 成员选择（群聊） ====================
@@ -862,7 +862,7 @@ async function uploadAndSendImage(file: File) {
   }
   await uploadAndSendMedia({
     file,
-    type: ImMessageType.IMAGE,
+    type: ImContentType.IMAGE,
     quote: context.quote,
     conversation: context.conversation
   })
@@ -882,7 +882,7 @@ async function uploadAndSendFile(file: File) {
   }
   await uploadAndSendMedia({
     file,
-    type: ImMessageType.FILE,
+    type: ImContentType.FILE,
     quote: context.quote,
     conversation: context.conversation
   })
@@ -924,7 +924,7 @@ async function onVoiceSend(payload: { blob: Blob; duration: number }) {
   const file = new File([payload.blob], `voice-${Date.now()}.webm`, { type: payload.blob.type })
   await uploadAndSendMedia({
     file,
-    type: ImMessageType.VOICE,
+    type: ImContentType.VOICE,
     quote: context.quote,
     conversation: context.conversation,
     context: { voiceDuration: payload.duration }
@@ -1034,7 +1034,7 @@ async function probeVideoFile(file: File): Promise<VideoProbe> {
  * 4. 视频链路耗时长，上传期间用户切会话则放弃发送（避免落到错误会话里）；切走再切回来不算变化（key 仍相等）
  */
 async function uploadAndSendVideo(file: File) {
-  if (!ensureMediaSizeWithinLimit(file, ImMessageType.VIDEO, message.warning)) {
+  if (!ensureMediaSizeWithinLimit(file, ImContentType.VIDEO, message.warning)) {
     return
   }
   const context = prepareMediaUpload()
@@ -1049,12 +1049,12 @@ async function uploadAndSendVideo(file: File) {
   //    （<video poster> 期待图片资源，传 video blob 在部分浏览器会退化成黑底，不是稳定行为）
   //    cover 等 probe 异步出真实 URL 后由 commit 阶段一起 patch；_localFile 留 file 供失败重试
   //    payload 拼装走 mediaTypeHandlers[VIDEO].build 与 commit 阶段共享同一份逻辑
-  const videoHandler = requireMediaHandler(ImMessageType.VIDEO)
+  const videoHandler = requireMediaHandler(ImContentType.VIDEO)
   const buildPlaceholderContent = (blobUrl: string): string =>
     serializeMessage(withQuotePayload(videoHandler.build(file, blobUrl, {}), replyQuote))
   const { clientMessageId } = insertMediaPlaceholder({
     file,
-    type: ImMessageType.VIDEO,
+    type: ImContentType.VIDEO,
     conversation,
     buildContent: buildPlaceholderContent
   })
@@ -1123,7 +1123,7 @@ async function uploadAndSendVideo(file: File) {
   }
   // 3.3 上传后会话校验 + muteOverlay 复查（与 useMediaUploader.uploadAndSendMedia 同一道）
   if (
-    !verifyMediaUploadStillAllowed(conversation, startKey, ImMessageType.VIDEO, clientMessageId)
+    !verifyMediaUploadStillAllowed(conversation, startKey, ImContentType.VIDEO, clientMessageId)
   ) {
     return
   }
@@ -1139,7 +1139,7 @@ async function uploadAndSendVideo(file: File) {
     )
   )
   await commitMediaPlaceholder({
-    type: ImMessageType.VIDEO,
+    type: ImContentType.VIDEO,
     conversation,
     clientMessageId,
     realContent
diff --git a/src/views/im/home/pages/conversation/components/message/MessageBubble.vue b/src/views/im/home/pages/conversation/components/message/MessageBubble.vue
index d766f2b12..e1935b6d2 100644
--- a/src/views/im/home/pages/conversation/components/message/MessageBubble.vue
+++ b/src/views/im/home/pages/conversation/components/message/MessageBubble.vue
@@ -157,7 +157,7 @@
     v-else
     class="px-3.5 py-2.5 text-sm italic rounded-lg text-[var(--el-text-color-secondary)] bg-[var(--el-fill-color-light)]"
   >
-    [不支持的消息类型]
+    [不支持的内容类型]
   </div>
 </template>
 
@@ -167,7 +167,7 @@ import Icon from '@/components/Icon/src/Icon.vue'
 import { formatFileSize } from '@/utils/file'
 import { formatSeconds } from '@/utils/formatTime'
 
-import { ImMessageType } from '@/views/im/utils/constants'
+import { ImContentType } from '@/views/im/utils/constants'
 import { MESSAGE_MERGE_PREVIEW_LINES } from '@/views/im/utils/config'
 import {
   parseMessage,
@@ -193,7 +193,7 @@ import MaterialBubble from './MaterialBubble.vue'
 defineOptions({ name: 'ImMessageBubble' })
 
 const props = defineProps<{
-  /** 消息类型，对齐 ImMessageType */
+  /** 内容类型，对齐 ImContentType */
   type: number
   /** 消息 content（JSON 字符串） */
   content: string
@@ -213,15 +213,15 @@ const emit = defineEmits<{
 }>()
 
 /** 各 type 判定 */
-const isText = computed(() => props.type === ImMessageType.TEXT)
-const isImage = computed(() => props.type === ImMessageType.IMAGE)
-const isFile = computed(() => props.type === ImMessageType.FILE)
-const isVoice = computed(() => props.type === ImMessageType.VOICE)
-const isVideo = computed(() => props.type === ImMessageType.VIDEO)
-const isFace = computed(() => props.type === ImMessageType.FACE)
-const isCard = computed(() => props.type === ImMessageType.CARD)
-const isMerge = computed(() => props.type === ImMessageType.MERGE)
-const isMaterial = computed(() => props.type === ImMessageType.MATERIAL)
+const isText = computed(() => props.type === ImContentType.TEXT)
+const isImage = computed(() => props.type === ImContentType.IMAGE)
+const isFile = computed(() => props.type === ImContentType.FILE)
+const isVoice = computed(() => props.type === ImContentType.VOICE)
+const isVideo = computed(() => props.type === ImContentType.VIDEO)
+const isFace = computed(() => props.type === ImContentType.FACE)
+const isCard = computed(() => props.type === ImContentType.CARD)
+const isMerge = computed(() => props.type === ImContentType.MERGE)
+const isMaterial = computed(() => props.type === ImContentType.MATERIAL)
 
 /** 媒体上传中：uploadProgress 非 null 即视为上传中 */
 const isUploading = computed(() => props.uploadProgress != null)
diff --git a/src/views/im/home/pages/conversation/components/message/MessageHistory.vue b/src/views/im/home/pages/conversation/components/message/MessageHistory.vue
index 0cc37a3dd..6c2ccd656 100644
--- a/src/views/im/home/pages/conversation/components/message/MessageHistory.vue
+++ b/src/views/im/home/pages/conversation/components/message/MessageHistory.vue
@@ -194,7 +194,7 @@
               <div class="mt-1.5">
                 <!-- 撤回：单独走灰色 tip，sender 名段可点击 -->
                 <div
-                  v-if="message.type === ImMessageType.RECALL"
+                  v-if="message.type === ImContentType.RECALL"
                   class="text-sm italic text-[var(--el-text-color-secondary)]"
                 >
                   <TipSegments :segments="recallTipSegmentsOf(message)" />
@@ -274,7 +274,7 @@ import { useMessagePuller } from '@/views/im/home/composables/useMessagePuller'
 import { useVoicePlayer } from '@/views/im/home/composables/useVoicePlayer'
 import {
   ImConversationType,
-  ImMessageType,
+  ImContentType,
   isFriendChatTip,
   isGroupNotification
 } from '@/views/im/utils/constants'
@@ -506,11 +506,11 @@ function matchesActiveFilter(message: Message): boolean {
   }
   switch (activeFilter.value.kind) {
     case 'file':
-      return message.type === ImMessageType.FILE
+      return message.type === ImContentType.FILE
     case 'image':
-      return message.type === ImMessageType.IMAGE
+      return message.type === ImContentType.IMAGE
     case 'voice':
-      return message.type === ImMessageType.VOICE
+      return message.type === ImContentType.VOICE
     case 'date':
       return dayjs(message.sendTime).format('YYYY-MM-DD') === activeFilter.value.day
     case 'member':
@@ -670,27 +670,27 @@ function textSnippetOf(message: Message): string {
     return resolveFriendNotificationText(message)
   }
   switch (message.type) {
-    case ImMessageType.TEXT:
+    case ImContentType.TEXT:
       return parseMessage<TextMessage>(message.content)?.content ?? ''
-    case ImMessageType.IMAGE:
+    case ImContentType.IMAGE:
       return '[图片]'
-    case ImMessageType.FILE:
+    case ImContentType.FILE:
       return parseMessage<FileMessage>(message.content)?.name ?? '[文件]'
-    case ImMessageType.VOICE:
+    case ImContentType.VOICE:
       return '[语音]'
-    case ImMessageType.VIDEO:
+    case ImContentType.VIDEO:
       return '[视频]'
-    case ImMessageType.CARD: {
+    case ImContentType.CARD: {
       const card = parseMessage<CardMessage>(message.content)
       return `[${getCardLabelInfo(card).label}] ${card?.name ?? ''}`
     }
-    case ImMessageType.FACE:
+    case ImContentType.FACE:
       return buildFacePreviewText(parseMessage<FaceMessage>(message.content))
-    case ImMessageType.MERGE: {
+    case ImContentType.MERGE: {
       const merge = parseMessage<MergeMessage>(message.content)
       return merge?.title ?? '[聊天记录]'
     }
-    case ImMessageType.RECALL:
+    case ImContentType.RECALL:
       return recallTipOf(message)
     default:
       return ''
diff --git a/src/views/im/home/pages/conversation/components/message/MessageItem.vue b/src/views/im/home/pages/conversation/components/message/MessageItem.vue
index 6fdea3e32..e329809d9 100644
--- a/src/views/im/home/pages/conversation/components/message/MessageItem.vue
+++ b/src/views/im/home/pages/conversation/components/message/MessageItem.vue
@@ -200,7 +200,7 @@ import { ElMessageBox } from 'element-plus'
 
 import {
   ImForwardMode,
-  ImMessageType,
+  ImContentType,
   ImMessageStatus,
   ImMessageReceiptStatus,
   ImConversationType,
@@ -304,7 +304,7 @@ const { confirm: confirmDialog, success: successMessage } = useMessage()
 // legacy:true 兼容 HTTP 环境，没有 navigator.clipboard 时降级到 execCommand
 const { copy: copyToClipboard } = useClipboard({ legacy: true })
 
-// ==================== 消息类型判断 ====================
+// ==================== 内容类型判断 ====================
 
 /** 是否在当前消息上方渲染时间分隔条：列表第一条 / 距上一条超过阈值；缺 sendTime 不渲染；频道素材每条都显示 */
 const shouldShowTimeTip = computed(() => {
@@ -321,15 +321,15 @@ const shouldShowTimeTip = computed(() => {
 })
 
 /** 仅 MessageItem 自身仍要用到的 type 判定（其它分支已下沉到 MessageBubble） */
-const isVoice = computed(() => props.message.type === ImMessageType.VOICE)
-const isMerge = computed(() => props.message.type === ImMessageType.MERGE)
+const isVoice = computed(() => props.message.type === ImContentType.VOICE)
+const isMerge = computed(() => props.message.type === ImContentType.MERGE)
 /**
  * 频道素材在「频道会话」内仿微信公众号样式（居中 + 无头像）；
  * 私聊 / 群聊里被转发过来的素材按 selfSend 走标准气泡布局（自己右、对方左、带头像）
  */
 const isMaterial = computed(
   () =>
-    props.message.type === ImMessageType.MATERIAL &&
+    props.message.type === ImContentType.MATERIAL &&
     conversationStore.activeConversation?.type === ImConversationType.CHANNEL
 )
 
@@ -342,7 +342,7 @@ const isChannelConversation = computed(
 // 这三类不走普通气泡，渲染成居中灰色 tip；判断 + 文案配对放一起，新增第四类事件只需在本块改完
 
 /** 是否已撤回：pull / WS 两路都会调 recallMessage 把原消息更新为 type=RECALL，渲染只需识别 type */
-const isRecall = computed(() => props.message.type === ImMessageType.RECALL)
+const isRecall = computed(() => props.message.type === ImContentType.RECALL)
 
 /** 撤回提示 segments：依赖 activeConversation 实时算 sender 名 */
 const recallTipSegments = computed(() => {
@@ -373,7 +373,7 @@ const groupNotificationSegments = computed(() =>
 
 /** 私聊 RTC_CALL_END 走「准气泡」（左右分布 + 电话图标 + 文案）；非私聊场景为 null */
 const rtcCallEndPrivatePayload = computed(() => {
-  if (props.message.type !== ImMessageType.RTC_CALL_END) {
+  if (props.message.type !== ImContentType.RTC_CALL_END) {
     return null
   }
   const payload = parseRtcCallPayload(props.message.content)
@@ -388,11 +388,15 @@ const rtcCallPrivateBubbleText = computed(() =>
   resolveRtcCallPrivateBubbleText(rtcCallEndPrivatePayload.value)
 )
 
-/** 是否会话内通话事件居中 tip：仅群聊场景（START 总是群聊；END 私聊走气泡分支，群聊走 tip） */
+/** 是否会话内群通话事件居中 tip */
 const isRtcCallTipMessage = computed(() => {
   if (!isRtcCallTip(props.message.type)) {
     return false
   }
+  const payload = parseRtcCallPayload(props.message.content)
+  if (payload?.conversationType !== ImConversationType.GROUP) {
+    return false
+  }
   return !isRtcCallPrivateBubbleMessage.value
 })
 
@@ -428,7 +432,7 @@ function handleMergeOpen(content: string) {
 
 /** 文本气泡 @ mention 候选名字：仅群消息有效，按 atUserIds 反查群成员真实昵称；非 TEXT 不走 store 读，让 getMentionCandidates 直接返回稳定空数组 */
 const textMentions = computed<MentionCandidate[]>(() => {
-  if (props.message.type !== ImMessageType.TEXT) {
+  if (props.message.type !== ImContentType.TEXT) {
     return getMentionCandidates(undefined, null)
   }
   return getMentionCandidates(props.message.atUserIds, conversationStore.activeConversation)
@@ -656,7 +660,7 @@ async function handleContextMenu(e: MouseEvent) {
 
   const items: MenuItem[] = []
   // 「复制」：仅文本消息支持；放在第一项，对齐微信桌面右键习惯
-  if (props.message.type === ImMessageType.TEXT) {
+  if (props.message.type === ImContentType.TEXT) {
     items.push({
       key: MENU_KEYS.COPY,
       name: '复制',
diff --git a/src/views/im/home/pages/conversation/components/message/ReplyPreview.vue b/src/views/im/home/pages/conversation/components/message/ReplyPreview.vue
index a0ef26b2c..fcc28dde8 100644
--- a/src/views/im/home/pages/conversation/components/message/ReplyPreview.vue
+++ b/src/views/im/home/pages/conversation/components/message/ReplyPreview.vue
@@ -106,7 +106,7 @@ import { formatFileSize } from '@/utils/file'
 import { useConversationStore } from '../../../../store/conversationStore'
 import { useMessageStore } from '../../../../store/messageStore'
 import { getSenderDisplayName } from '@/views/im/utils/user'
-import { ImMessageType } from '@/views/im/utils/constants'
+import { ImContentType } from '@/views/im/utils/constants'
 import { getClientConversationId } from '@/views/im/utils/db'
 import CardLineLabel from '@/views/im/home/components/card/CardLineLabel.vue'
 import {
@@ -165,7 +165,7 @@ const liveMessage = computed(() => {
 })
 
 /** 命中本地缓存且 type === RECALL 才判定为已撤回;不在缓存的当快照仍有效 */
-const isRecalled = computed(() => liveMessage.value?.type === ImMessageType.RECALL)
+const isRecalled = computed(() => liveMessage.value?.type === ImContentType.RECALL)
 
 /** 渲染时实时算,与气泡上方显示名走同一套规则,避免备注变更后引用块陈旧 */
 const senderName = computed(() => {
@@ -189,12 +189,12 @@ type AnyQuotePayload = Partial<
 >
 const parsedPayload = computed(() => parseMessage<AnyQuotePayload>(props.quote.content))
 
-const isText = computed(() => props.quote.type === ImMessageType.TEXT)
-const isFile = computed(() => props.quote.type === ImMessageType.FILE)
-const isVoice = computed(() => props.quote.type === ImMessageType.VOICE)
-const isCard = computed(() => props.quote.type === ImMessageType.CARD)
-const isFace = computed(() => props.quote.type === ImMessageType.FACE)
-const isMaterial = computed(() => props.quote.type === ImMessageType.MATERIAL)
+const isText = computed(() => props.quote.type === ImContentType.TEXT)
+const isFile = computed(() => props.quote.type === ImContentType.FILE)
+const isVoice = computed(() => props.quote.type === ImContentType.VOICE)
+const isCard = computed(() => props.quote.type === ImContentType.CARD)
+const isFace = computed(() => props.quote.type === ImContentType.FACE)
+const isMaterial = computed(() => props.quote.type === ImContentType.MATERIAL)
 
 /** 文本超过 MAX_TEXT_PREVIEW_LEN 截断，长内容不撑爆引用块 */
 const textPreview = computed(() => {
@@ -211,13 +211,13 @@ const thumbnailUrl = computed<string | undefined>(() => {
     return undefined
   }
   const { type } = props.quote
-  if (type === ImMessageType.IMAGE) {
+  if (type === ImContentType.IMAGE) {
     return parsedPayload.value?.thumbnailUrl || parsedPayload.value?.url
   }
-  if (type === ImMessageType.VIDEO || type === ImMessageType.MATERIAL) {
+  if (type === ImContentType.VIDEO || type === ImContentType.MATERIAL) {
     return parsedPayload.value?.coverUrl
   }
-  if (type === ImMessageType.FACE) {
+  if (type === ImContentType.FACE) {
     return parsedPayload.value?.url
   }
   return undefined
diff --git a/src/views/im/home/pages/conversation/components/message/forward/MessageForwardDialog.vue b/src/views/im/home/pages/conversation/components/message/forward/MessageForwardDialog.vue
index 67c193070..440473768 100644
--- a/src/views/im/home/pages/conversation/components/message/forward/MessageForwardDialog.vue
+++ b/src/views/im/home/pages/conversation/components/message/forward/MessageForwardDialog.vue
@@ -160,7 +160,7 @@ import { useMessageMultiSelect } from '@/views/im/home/composables/useMessageMul
 import {
   ImConversationType,
   ImForwardMode,
-  ImMessageType,
+  ImContentType,
   type ImForwardModeValue
 } from '@/views/im/utils/constants'
 import { MESSAGE_MERGE_PREVIEW_LINES } from '@/views/im/utils/config'
@@ -300,7 +300,7 @@ async function forwardToTarget(target: Conversation): Promise<boolean> {
     if (!content) {
       return false
     }
-    return sendRaw(ImMessageType.MERGE, content, { conversation: target })
+    return sendRaw(ImContentType.MERGE, content, { conversation: target })
   }
   for (const payload of cleanedSinglePayloads.value) {
     const ok = await sendRaw(payload.type, payload.content, { conversation: target })
diff --git a/src/views/im/home/store/groupStore.ts b/src/views/im/home/store/groupStore.ts
index 5b09ae54a..b85904094 100644
--- a/src/views/im/home/store/groupStore.ts
+++ b/src/views/im/home/store/groupStore.ts
@@ -18,7 +18,7 @@ import {
   ImConversationType,
   ImGroupMemberRole,
   ImMessageStatus,
-  ImMessageType
+  ImContentType
 } from '../../utils/constants'
 import { CommonStatusEnum } from '@/utils/constants'
 import { getDb } from '../../utils/db'
@@ -603,37 +603,37 @@ export const useGroupStore = defineStore('imGroupStore', {
         return
       }
       switch (type) {
-        case ImMessageType.GROUP_CREATE:
+        case ImContentType.GROUP_CREATE:
           this.applyGroupCreateNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_NAME_UPDATE:
+        case ImContentType.GROUP_NAME_UPDATE:
           this.applyGroupNameUpdateNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_NOTICE_UPDATE:
+        case ImContentType.GROUP_NOTICE_UPDATE:
           this.applyGroupNoticeUpdateNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_INFO_UPDATE:
+        case ImContentType.GROUP_INFO_UPDATE:
           this.applyGroupInfoUpdateNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_DISSOLVE:
+        case ImContentType.GROUP_DISSOLVE:
           this.removeGroup(groupId)
           break
-        case ImMessageType.GROUP_MEMBER_INVITE:
+        case ImContentType.GROUP_MEMBER_INVITE:
           this.applyGroupMemberInviteNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MEMBER_ENTER:
+        case ImContentType.GROUP_MEMBER_ENTER:
           this.applyGroupMemberEnterNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MEMBER_QUIT:
+        case ImContentType.GROUP_MEMBER_QUIT:
           this.applyGroupMemberQuitNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MEMBER_KICK:
+        case ImContentType.GROUP_MEMBER_KICK:
           this.applyGroupMemberKickNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MEMBER_NICKNAME_UPDATE:
+        case ImContentType.GROUP_MEMBER_NICKNAME_UPDATE:
           this.applyGroupMemberNicknameUpdateNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_ADMIN_ADD:
+        case ImContentType.GROUP_ADMIN_ADD:
           this.updateGroupMemberRoleList(
             groupId,
             payload.memberUserIds || [],
@@ -645,7 +645,7 @@ export const useGroupStore = defineStore('imGroupStore', {
             refreshUnhandledGroupRequests()
           }
           break
-        case ImMessageType.GROUP_ADMIN_REMOVE:
+        case ImContentType.GROUP_ADMIN_REMOVE:
           this.updateGroupMemberRoleList(
             groupId,
             payload.memberUserIds || [],
@@ -656,28 +656,28 @@ export const useGroupStore = defineStore('imGroupStore', {
             refreshUnhandledGroupRequests()
           }
           break
-        case ImMessageType.GROUP_OWNER_TRANSFER:
+        case ImContentType.GROUP_OWNER_TRANSFER:
           this.applyGroupOwnerTransferNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MESSAGE_PIN:
+        case ImContentType.GROUP_MESSAGE_PIN:
           this.applyGroupMessagePinNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MESSAGE_UNPIN:
+        case ImContentType.GROUP_MESSAGE_UNPIN:
           this.applyGroupMessageUnpinNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MEMBER_MUTED:
+        case ImContentType.GROUP_MEMBER_MUTED:
           this.applyGroupMemberMutedNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MEMBER_CANCEL_MUTED:
+        case ImContentType.GROUP_MEMBER_CANCEL_MUTED:
           this.applyGroupMemberCancelMutedNotification(groupId, payload)
           break
-        case ImMessageType.GROUP_MUTED:
+        case ImContentType.GROUP_MUTED:
           this.updateGroupFields(groupId, { mutedAll: true })
           break
-        case ImMessageType.GROUP_CANCEL_MUTED:
+        case ImContentType.GROUP_CANCEL_MUTED:
           this.updateGroupFields(groupId, { mutedAll: false })
           break
-        case ImMessageType.GROUP_BANNED:
+        case ImContentType.GROUP_BANNED:
           this.updateGroupFields(groupId, { banned: !!payload.banned })
           break
       }
diff --git a/src/views/im/home/store/messageStore.ts b/src/views/im/home/store/messageStore.ts
index 7f6555f77..bdb3b3e21 100644
--- a/src/views/im/home/store/messageStore.ts
+++ b/src/views/im/home/store/messageStore.ts
@@ -6,7 +6,7 @@ import {
   ImConversationType,
   ImMessageReceiptStatus,
   ImMessageStatus,
-  ImMessageType,
+  ImContentType,
   isGroupNotification,
   isNormalMessage
 } from '../../utils/constants'
@@ -436,7 +436,7 @@ export const useMessageStore = defineStore('imMessageStore', {
         return null
       }
       // 2. 更新消息和会话摘要
-      message.type = ImMessageType.RECALL
+      message.type = ImContentType.RECALL
       message.status = ImMessageStatus.RECALL
       message.content = ''
       if (messages[messages.length - 1]?.id === messageId) {
diff --git a/src/views/im/home/store/websocketStore.ts b/src/views/im/home/store/websocketStore.ts
index ea7cb98ee..42d049ea1 100644
--- a/src/views/im/home/store/websocketStore.ts
+++ b/src/views/im/home/store/websocketStore.ts
@@ -6,7 +6,7 @@ import {
   ImWebSocketMessageType,
   ImMessageStatus,
   ImMessageReceiptStatus,
-  ImMessageType,
+  ImContentType,
   ImConversationType,
   ImRtcCallMediaType,
   ImRtcParticipantStatus,
@@ -47,15 +47,19 @@ import type { ImChannelMessageRespVO } from '@/api/im/message/channel'
 import { buildChannelConversationStub } from '../../utils/channel'
 import type {
   WebSocketFrame,
-  ImPrivateMessageDTO,
-  ImGroupMessageDTO,
+  ImNotificationWebSocketDTO,
+  ImNoConversationNotification,
+  ImPrivateMessageNotification,
+  ImGroupMessageNotification,
+  ImMessageReadNotification,
+  ImMessageReceiptNotification,
   Message,
   Group
 } from '../types'
 
 /** FRIEND_DELETE 帧 payload 是否带 clear=true：clear 语义是清会话本身，跳过气泡渲染 */
-const isFriendDeleteWithClear = (frame: ImPrivateMessageDTO): boolean => {
-  if (frame.type !== ImMessageType.FRIEND_DELETE) {
+const isFriendDeleteWithClear = (frame: ImPrivateMessageNotification): boolean => {
+  if (frame.type !== ImContentType.FRIEND_DELETE) {
     return false
   }
   try {
@@ -66,6 +70,16 @@ const isFriendDeleteWithClear = (frame: ImPrivateMessageDTO): boolean => {
   }
 }
 
+/** 从私聊消息帧解析好友通知 payload */
+const parseFriendNotificationPayload = (
+  frame: ImPrivateMessageNotification
+): FriendNotificationPayload => JSON.parse(frame.content || '{}') as FriendNotificationPayload
+
+/** 私聊消息帧是否可推断好友对端 */
+const isPrivateMessageNotification = (
+  frame: ImPrivateMessageNotification | ImNoConversationNotification
+): frame is ImPrivateMessageNotification => 'senderId' in frame && 'receiverId' in frame
+
 const RTC_LIVEKIT_PROTOCOLS = new Set(['ws:', 'wss:', 'http:', 'https:'])
 const RTC_MEDIA_TYPES = new Set<number>(Object.values(ImRtcCallMediaType))
 
@@ -105,7 +119,7 @@ function isValidRtcInvitePayload(payload: ImRtcCallNotification): boolean {
  * 不写发送人名字段：渲染层走 utils/user 实时算（备注 / 群昵称变更后历史消息自动刷新）
  */
 const convertPrivateMessage = (
-  websocketMessage: ImPrivateMessageDTO,
+  websocketMessage: ImPrivateMessageNotification,
   currentUserId: number
 ): Message => ({
   id: websocketMessage.id,
@@ -126,7 +140,7 @@ const convertPrivateMessage = (
  * receiptStatus / readCount 让多端同步收到自己发的群消息时回执 UI 立刻就有数据
  */
 const convertGroupMessage = (
-  websocketMessage: ImGroupMessageDTO,
+  websocketMessage: ImGroupMessageNotification,
   currentUserId: number
 ): Message => ({
   id: websocketMessage.id,
@@ -150,7 +164,7 @@ const convertGroupMessage = (
  * 职责（不只是连通信，也是后端 IM 事件的统一入口 → 联动 conversationStore / friendStore / groupStore）：
  *
  * 1. 链路管理：建连 / 断连 / 心跳保活 / 自动重连
- * 2. 帧分发：dispatchFrame → dispatchPrivateFrame / dispatchGroupFrame，按 ImMessageType 再分流
+ * 2. 帧分发：dispatchFrame → dispatchPrivateFrame / dispatchGroupFrame，按会话和内容类型分流
  * 3. 缓冲：初始化加载期（conversationStore.loading=true）暂存消息，等 pull 完成后由 useMessagePuller 调 flushBuffer 回放
  * 4. 事件处理（按类型分发到对应 handle*，联动 conversation / friend / group store）：
  *    - 普通消息（TEXT / IMAGE / FILE / VOICE / VIDEO）：入库 + 当前会话自动已读 / 提示音
@@ -168,8 +182,14 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     reconnectAttempts: 0,
     heartbeatTimer: null as ReturnType<typeof setInterval> | null,
     messageBuffer: [] as Array<
-      | { conversationType: typeof ImConversationType.PRIVATE; payload: ImPrivateMessageDTO }
-      | { conversationType: typeof ImConversationType.GROUP; payload: ImGroupMessageDTO }
+      | {
+          conversationType: typeof ImConversationType.PRIVATE
+          payload: ImPrivateMessageNotification
+        }
+      | {
+          conversationType: typeof ImConversationType.GROUP
+          payload: ImGroupMessageNotification
+        }
       | { conversationType: typeof ImConversationType.CHANNEL; payload: ImChannelMessageRespVO }
     > // 初始化加载期内，先把普通消息丢进缓冲区，pull 完成后再一次性回放
   }),
@@ -276,26 +296,60 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     },
 
     /**
-     * 按帧 type 分发：外层只有私聊 / 群聊两个通道，其它事件（已读、回执、好友 / 群变更）
-     * 由各自 dispatchXxxFrame 按 payload.type（ImMessageType）再分流
+     * 按 IM 通知帧分发
      */
     dispatchFrame(frame: WebSocketFrame) {
-      const content = this.safeParse(frame.content)
-      if (!content) {
+      if (frame.type !== ImWebSocketMessageType.NOTIFICATION) {
+        console.debug('[IM WS] 未识别事件', frame)
         return
       }
-      switch (frame.type) {
-        case ImWebSocketMessageType.PRIVATE_MESSAGE:
-          this.dispatchPrivateFrame(content as ImPrivateMessageDTO)
+
+      const notification = this.safeParse(frame.content) as ImNotificationWebSocketDTO | null
+      if (!notification?.payload || !notification.contentType) {
+        return
+      }
+      const payload = {
+        ...notification.payload,
+        type: notification.contentType
+      }
+      switch (notification.conversationType) {
+        case ImConversationType.PRIVATE:
+          this.dispatchPrivateFrame(payload as ImPrivateMessageNotification)
           break
-        case ImWebSocketMessageType.GROUP_MESSAGE:
-          this.dispatchGroupFrame(content as ImGroupMessageDTO)
+        case ImConversationType.GROUP:
+          this.dispatchGroupFrame(payload as ImGroupMessageNotification)
           break
-        case ImWebSocketMessageType.CHANNEL_MESSAGE:
-          this.dispatchChannelFrame(content as ImChannelMessageRespVO)
+        case ImConversationType.CHANNEL:
+          this.dispatchChannelFrame(payload as ImChannelMessageRespVO)
+          break
+        case ImConversationType.NONE:
+          this.dispatchNoConversationFrame(payload as ImNoConversationNotification)
           break
         default:
-          console.debug('[IM WS] 未识别事件', frame)
+          console.debug('[IM WS] 未识别通知', notification)
+      }
+    },
+
+    /**
+     * 无会话通知分发
+     */
+    dispatchNoConversationFrame(websocketMessage: ImNoConversationNotification) {
+      if (isFriendNotification(websocketMessage.type)) {
+        this.handleFriendNotification(websocketMessage)
+        return
+      }
+      if (isGroupRequestNotification(websocketMessage.type)) {
+        this.handleGroupRequestNotification(websocketMessage)
+        return
+      }
+      switch (websocketMessage.type) {
+        case ImContentType.RTC_CALL:
+        case ImContentType.RTC_PARTICIPANT_CONNECTED:
+        case ImContentType.RTC_PARTICIPANT_DISCONNECTED:
+          this.handleRtcSignaling(websocketMessage)
+          break
+        default:
+          console.debug('[IM WS] 未识别无会话通知', websocketMessage)
       }
     },
 
@@ -303,7 +357,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
      * 频道帧分发：按 payload.type 分到 READ（多端已读同步）或普通素材推送
      */
     dispatchChannelFrame(websocketMessage: ImChannelMessageRespVO) {
-      if (websocketMessage.type === ImMessageType.READ) {
+      if (websocketMessage.type === ImContentType.READ) {
         this.handleChannelRead(websocketMessage)
         return
       }
@@ -351,22 +405,28 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
         conversationStore.activeConversation?.type === ImConversationType.CHANNEL &&
         conversationStore.activeConversation?.targetId === websocketMessage.channelId
       // 频道单向订阅，receiptStatus 表达「我是否已读这条」：会话打开即已读 DONE，否则 PENDING（与 pull 口径一致）
-      const persistPromise = messageStore.insertMessage(buildChannelConversationStub(websocketMessage.channelId), {
-        id: websocketMessage.id,
-        clientMessageId: '',
-        type: websocketMessage.type,
-        content: websocketMessage.content,
-        status: ImMessageStatus.NORMAL,
-        receiptStatus: isActive ? ImMessageReceiptStatus.DONE : ImMessageReceiptStatus.PENDING,
-        sendTime: sendTimeMs,
-        senderId: 0,
-        targetId: websocketMessage.channelId,
-        selfSend: false,
-        materialId: websocketMessage.materialId
-      })
+      const persistPromise = messageStore.insertMessage(
+        buildChannelConversationStub(websocketMessage.channelId),
+        {
+          id: websocketMessage.id,
+          clientMessageId: '',
+          type: websocketMessage.type,
+          content: websocketMessage.content,
+          status: ImMessageStatus.NORMAL,
+          receiptStatus: isActive ? ImMessageReceiptStatus.DONE : ImMessageReceiptStatus.PENDING,
+          sendTime: sendTimeMs,
+          senderId: 0,
+          targetId: websocketMessage.channelId,
+          selfSend: false,
+          materialId: websocketMessage.materialId
+        }
+      )
       if (isActive) {
         // 窗口打开 = 已读：本端清未读 + 上报服务端读位置，避免读位置滞后
-        conversationStore.markConversationRead(ImConversationType.CHANNEL, websocketMessage.channelId)
+        conversationStore.markConversationRead(
+          ImConversationType.CHANNEL,
+          websocketMessage.channelId
+        )
         apiReadChannelMessages(websocketMessage.channelId, websocketMessage.id).catch((e) => {
           console.warn('[IM WS] 频道自动已读上报失败', e)
         })
@@ -396,44 +456,31 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     // ==================== 普通消息 ====================
 
     /**
-     * 私聊统一帧分发：按 payload.type（ImMessageType）分到已读 / 回执 / 好友通知 / 普通消息
+     * 私聊统一帧分发：按 payload.type（ImContentType）分到已读 / 回执 / 好友通知 / 普通消息
      *
-     * 对应后端 ImPrivateMessageDTO 的 ofRead / ofReceipt / ofFriendNotification / ofSend
+     * 消息通知、已读通知、回执通知由外层 contentType 统一分发
      */
-    dispatchPrivateFrame(websocketMessage: ImPrivateMessageDTO) {
+    dispatchPrivateFrame(websocketMessage: ImPrivateMessageNotification) {
       try {
         switch (websocketMessage.type) {
-          case ImMessageType.READ:
-            this.handlePrivateRead(websocketMessage)
+          case ImContentType.READ:
+            this.handlePrivateRead(websocketMessage as ImMessageReadNotification)
             break
-          case ImMessageType.RECEIPT:
-            this.handlePrivateReceipt(websocketMessage)
+          case ImContentType.RECEIPT:
+            this.handlePrivateReceipt(websocketMessage as ImMessageReceiptNotification)
             break
-          case ImMessageType.RTC_CALL:
-          case ImMessageType.RTC_PARTICIPANT_CONNECTED:
-          case ImMessageType.RTC_PARTICIPANT_DISCONNECTED:
-            this.handleRtcSignaling(websocketMessage)
-            break
-          case ImMessageType.RTC_CALL_END:
+          case ImContentType.RTC_CALL_END:
             // 入库 + 关闭通话窗 + 渲染聊天 tip（私聊场景）
             this.handleRtcCallEnd(websocketMessage)
             ignoreRealtimePersistError(this.handlePrivateMessage(websocketMessage))
             break
           default:
-            if (isFriendNotification(websocketMessage.type)) {
+            if (isFriendChatTip(websocketMessage.type)) {
               this.handleFriendNotification(websocketMessage)
-              // FRIEND_ADD / FRIEND_DELETE：同时作为会话事件气泡插入消息列表
-              //            （becomeFriends 入库帧 + silent / delete 单边推送帧统一走入库去重路径，前端按 type 渲染灰色提示）；
               // FRIEND_DELETE 的 clear=true 语义是清会话本身，跳过气泡避免在已清会话里写入虚拟消息
-              if (
-                isFriendChatTip(websocketMessage.type) &&
-                !isFriendDeleteWithClear(websocketMessage)
-              ) {
+              if (!isFriendDeleteWithClear(websocketMessage)) {
                 ignoreRealtimePersistError(this.handlePrivateMessage(websocketMessage))
               }
-            } else if (isGroupRequestNotification(websocketMessage.type)) {
-              // 加群申请通知（1503 / 1505 / 1506）走私聊通道，与好友通知同段位但分开 dispatcher
-              this.handleGroupRequestNotification(websocketMessage)
             } else {
               // TEXT / IMAGE / FILE / VOICE / VIDEO 等普通消息
               ignoreRealtimePersistError(this.handlePrivateMessage(websocketMessage))
@@ -446,27 +493,27 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     },
 
     /**
-     * 群聊统一帧分发：按 payload.type（ImMessageType）分到已读 / 回执 / 群个人信号 / 普通消息
+     * 群聊统一帧分发：按 payload.type（ImContentType）分到已读 / 回执 / 群个人信号 / 普通消息
      *
      * 1530 GROUP_MEMBER_SETTING_UPDATE 是个人信号；其它（普通消息 + 1501-1520 段位群广播事件）走 handleGroupMessage 入库 + 触发 applyGroupNotification 旁路
      */
-    dispatchGroupFrame(websocketMessage: ImGroupMessageDTO) {
+    dispatchGroupFrame(websocketMessage: ImGroupMessageNotification) {
       try {
         switch (websocketMessage.type) {
-          case ImMessageType.READ:
-            this.handleGroupRead(websocketMessage)
+          case ImContentType.READ:
+            this.handleGroupRead(websocketMessage as ImMessageReadNotification)
             break
-          case ImMessageType.RECEIPT:
-            this.handleGroupReceipt(websocketMessage)
+          case ImContentType.RECEIPT:
+            this.handleGroupReceipt(websocketMessage as ImMessageReceiptNotification)
             break
-          case ImMessageType.GROUP_MEMBER_SETTING_UPDATE:
+          case ImContentType.GROUP_MEMBER_SETTING_UPDATE:
             this.handleGroupMemberSettingUpdate(websocketMessage)
             break
-          case ImMessageType.RTC_CALL_START:
+          case ImContentType.RTC_CALL_START:
             // 入库 + 渲染聊天 tip；胶囊条状态走 1602/1603，本帧不动 rtcStore，避免与首次填充竞争
             ignoreRealtimePersistError(this.handleGroupMessage(websocketMessage))
             break
-          case ImMessageType.RTC_CALL_END:
+          case ImContentType.RTC_CALL_END:
             // 入库 + 移除胶囊条 + 关闭通话窗（如果当前在该群通话内）
             this.handleRtcCallEnd(websocketMessage)
             ignoreRealtimePersistError(this.handleGroupMessage(websocketMessage))
@@ -491,7 +538,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
      * 4. 构造前端 Message，插入到对应私聊会话
      * 5. 当前会话激活时自动上报已读；否则非免打扰响提示音
      */
-    handlePrivateMessage(websocketMessage: ImPrivateMessageDTO): Promise<void> {
+    handlePrivateMessage(websocketMessage: ImPrivateMessageNotification): Promise<void> {
       const conversationStore = useConversationStore()
       const friendStore = useFriendStore()
       const currentUserId = getCurrentUserId()
@@ -527,9 +574,9 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
       // 会话标题永远跟「对端」走（不管谁发的消息）；这里只算一次给 insertMessage 用
       const peerDisplayName = friend ? getFriendDisplayName(friend) : ''
 
-      // 3. 后端撤回：下发一条 RECALL 消息，content 为 `{"messageId": xxx}`（对齐 ImMessageTypeEnum.RECALL → RecallMessage）
+      // 3. 后端撤回：下发一条 RECALL 消息，content 为 `{"messageId": xxx}`（对齐 ImContentTypeEnum.RECALL → RecallMessage）
       // 这里拦截下来改走 recallMessage（把原消息更新为 RECALL 态），不让它作为新消息进列表
-      if (websocketMessage.type === ImMessageType.RECALL) {
+      if (websocketMessage.type === ImContentType.RECALL) {
         return useMessageStore().recallMessage(
           ImConversationType.PRIVATE,
           peerId,
@@ -574,10 +621,13 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     },
 
     /** 私聊 READ 事件：自己的其它终端在对方会话里标为已读，本端同步清零未读；私聊已读关闭时兜底忽略 */
-    handlePrivateRead(websocketMessage: ImPrivateMessageDTO) {
+    handlePrivateRead(websocketMessage: ImMessageReadNotification) {
       if (!MESSAGE_PRIVATE_READ_ENABLED) {
         return
       }
+      if (!websocketMessage.id || !websocketMessage.receiverId) {
+        return
+      }
       void useMessageStore()
         .applyConversationReadList([
           {
@@ -592,16 +642,19 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
 
     /**
      * 私聊 RECEIPT 事件：对方读了我的消息，把和对方会话里自己发的消息标为已读
-     * 后端将 maxReadId 编码在 DTO 的 id 字段（见 ImPrivateMessageDTO.ofReceipt），
+     * 后端将 maxReadId 编码在通知的 id 字段，
      * 这里据此卡边界，避免把"回执在路上时刚发的消息"误标为已读；私聊已读关闭时兜底忽略
      */
-    handlePrivateReceipt(websocketMessage: ImPrivateMessageDTO) {
+    handlePrivateReceipt(websocketMessage: ImMessageReceiptNotification) {
       if (!MESSAGE_PRIVATE_READ_ENABLED) {
         return
       }
       if (!websocketMessage.id) {
         return
       }
+      if (!websocketMessage.senderId) {
+        return
+      }
       useMessageStore().applyMessageReadReceipt({
         conversationType: ImConversationType.PRIVATE,
         targetId: websocketMessage.senderId,
@@ -619,7 +672,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
      * 4. 构造 Message + at 字段，插入到对应群聊会话（发送人名渲染时实时算）
      * 5. 当前会话激活时自动上报已读（带 lastMessageId）；否则非免打扰响提示音
      */
-    handleGroupMessage(websocketMessage: ImGroupMessageDTO): Promise<void> {
+    handleGroupMessage(websocketMessage: ImGroupMessageNotification): Promise<void> {
       const conversationStore = useConversationStore()
       const groupStore = useGroupStore()
       const currentUserId = getCurrentUserId()
@@ -656,7 +709,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
 
       // 3. 后端撤回：下发一条 RECALL 消息，content 为 `{"messageId": xxx}`
       // 这里拦截下来改走 recallMessage（把原消息更新为 RECALL 态）
-      if (websocketMessage.type === ImMessageType.RECALL) {
+      if (websocketMessage.type === ImContentType.RECALL) {
         return useMessageStore().recallMessage(
           ImConversationType.GROUP,
           websocketMessage.groupId,
@@ -688,10 +741,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
           conversationStore.activeConversation?.targetId === websocketMessage.groupId
         if (isActive) {
           // 群已读上报需要带 messageId（群消息以"读到第几条"的游标为准，区别于私聊只标 receiverId）；群已读关闭时仅本地清零
-          conversationStore.markConversationRead(
-            ImConversationType.GROUP,
-            websocketMessage.groupId
-          )
+          conversationStore.markConversationRead(ImConversationType.GROUP, websocketMessage.groupId)
           if (MESSAGE_GROUP_READ_ENABLED) {
             apiReadGroupMessages(websocketMessage.groupId, websocketMessage.id).catch((e) => {
               console.warn('[IM WS] 自动已读上报失败', e)
@@ -708,11 +758,14 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     // ==================== 群聊已读 / 回执 ====================
 
     /** 群聊 READ：自己其它终端在某群里标为已读，本端同步清零该群未读 + @ 红字；群已读关闭时兜底忽略 */
-    handleGroupRead(websocketMessage: ImGroupMessageDTO) {
+    handleGroupRead(websocketMessage: ImMessageReadNotification) {
       if (!MESSAGE_GROUP_READ_ENABLED) {
         return
       }
       const readMessageId = websocketMessage.readId || websocketMessage.id
+      if (!readMessageId || !websocketMessage.groupId) {
+        return
+      }
       void useMessageStore()
         .applyConversationReadList([
           {
@@ -726,10 +779,13 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     },
 
     /** 群聊 RECEIPT：更新某条群消息的 readCount / receiptStatus；群已读关闭时兜底忽略 */
-    handleGroupReceipt(websocketMessage: ImGroupMessageDTO) {
+    handleGroupReceipt(websocketMessage: ImMessageReceiptNotification) {
       if (!MESSAGE_GROUP_READ_ENABLED) {
         return
       }
+      if (!websocketMessage.id || !websocketMessage.groupId) {
+        return
+      }
       useMessageStore().applyMessageReadReceipt({
         conversationType: ImConversationType.GROUP,
         targetId: websocketMessage.groupId,
@@ -739,59 +795,63 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
       })
     },
 
-    // ==================== 好友通知（1201-1210 段位，承载于私聊通道） ====================
+    // ==================== 好友通知（1201-1210 段位） ====================
 
     /**
      * 算 FRIEND_ADD / FRIEND_DELETE 帧的「对端 userId」：
      *    becomeFriends 单条入库后双方收到同一份 payload，payload.friendUserId 固定是 toUserId，本端真正的对端要从帧 sender / receiver 反推
      */
-    computeFriendPeerId(frame: ImPrivateMessageDTO): number {
+    computeFriendPeerId(frame: ImPrivateMessageNotification): number {
       const currentUserId = getCurrentUserId()
       return getPrivateMessagePeerId(frame, currentUserId)
     },
 
     /**
-     * 好友通知统一入口：解析 content 里的 payload，按 type 分发到 friendStore 内部 dispatcher
-     *
-     * 对应后端 ImPrivateMessageDTO.ofFriendNotification 系列；
-     * payload 实际类型见 BaseFriendNotification 子类（FriendRequestNotification / FriendAddNotification 等）
+     * 好友通知统一入口：按 type 分发到 friendStore 内部 dispatcher
      */
-    handleFriendNotification(websocketMessage: ImPrivateMessageDTO) {
-      // content 解析失败由外层 dispatchPrivateFrame 的 try-catch 兜底（含 websocketMessage 打印），不重复 catch
-      const payload = JSON.parse(websocketMessage.content || '{}') as FriendNotificationPayload
+    handleFriendNotification(
+      websocketMessage: ImPrivateMessageNotification | ImNoConversationNotification
+    ) {
+      const payload = isPrivateMessageNotification(websocketMessage)
+        ? parseFriendNotificationPayload(websocketMessage)
+        : (websocketMessage as unknown as FriendNotificationPayload)
       const friendStore = useFriendStore()
       switch (websocketMessage.type) {
-        case ImMessageType.FRIEND_REQUEST_RECEIVED:
+        case ImContentType.FRIEND_REQUEST_RECEIVED:
           friendStore.applyFriendRequestReceivedNotification(payload)
           break
-        case ImMessageType.FRIEND_REQUEST_APPROVED:
+        case ImContentType.FRIEND_REQUEST_APPROVED:
           friendStore.applyFriendRequestApprovedNotification(payload)
           break
-        case ImMessageType.FRIEND_REQUEST_REJECTED:
+        case ImContentType.FRIEND_REQUEST_REJECTED:
           friendStore.applyFriendRequestRejectedNotification(payload)
           break
-        case ImMessageType.FRIEND_ADD:
+        case ImContentType.FRIEND_ADD:
           friendStore.applyFriendAddNotification(
             payload,
-            this.computeFriendPeerId(websocketMessage)
+            isPrivateMessageNotification(websocketMessage)
+              ? this.computeFriendPeerId(websocketMessage)
+              : payload.friendUserId
           )
           break
-        case ImMessageType.FRIEND_DELETE:
+        case ImContentType.FRIEND_DELETE:
           friendStore.applyFriendDeleteNotification(
             payload,
-            this.computeFriendPeerId(websocketMessage)
+            isPrivateMessageNotification(websocketMessage)
+              ? this.computeFriendPeerId(websocketMessage)
+              : payload.friendUserId
           )
           break
-        case ImMessageType.FRIEND_BLOCK:
+        case ImContentType.FRIEND_BLOCK:
           friendStore.applyFriendBlockNotification(payload)
           break
-        case ImMessageType.FRIEND_UNBLOCK:
+        case ImContentType.FRIEND_UNBLOCK:
           friendStore.applyFriendUnblockNotification(payload)
           break
-        case ImMessageType.FRIEND_INFO_UPDATED:
+        case ImContentType.FRIEND_INFO_UPDATED:
           friendStore.applyFriendInfoUpdatedNotification(payload)
           break
-        case ImMessageType.FRIEND_UPDATE:
+        case ImContentType.FRIEND_UPDATE:
           friendStore.applyFriendUpdateNotification(payload)
           break
         default:
@@ -799,29 +859,23 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
       }
     },
 
-    // ==================== 加群申请通知（1503 / 1505 / 1506，承载于私聊通道） ====================
+    // ==================== 加群申请通知（1503 / 1505 / 1506） ====================
 
     /**
      * 加群申请通知统一入口：分发到 groupRequestStore，驱动横幅 + Drawer 同步
-     *
-     * 对应后端 ImPrivateMessageDTO.ofGroupNotification 系列：
-     * - 1503：admin 侧拉单条 push 进 unhandledList；申请人侧不收
-     * - 1505 / 1506：admin 侧从 unhandledList 移除；同意走 1509 / 1510 群事件渲染系统提示，拒绝静默不打扰
      */
-    handleGroupRequestNotification(websocketMessage: ImPrivateMessageDTO) {
-      const payload = JSON.parse(websocketMessage.content || '{}') as {
-        requestId?: number
-      }
+    handleGroupRequestNotification(websocketMessage: ImNoConversationNotification) {
+      const payload = websocketMessage as { requestId?: number }
       if (!payload.requestId) {
         return
       }
       const groupRequestStore = useGroupRequestStore()
       switch (websocketMessage.type) {
-        case ImMessageType.GROUP_REQUEST_RECEIVED:
+        case ImContentType.GROUP_REQUEST_RECEIVED:
           groupRequestStore.addGroupRequestById(payload.requestId).catch(() => undefined)
           break
-        case ImMessageType.GROUP_REQUEST_APPROVED:
-        case ImMessageType.GROUP_REQUEST_REJECTED:
+        case ImContentType.GROUP_REQUEST_APPROVED:
+        case ImContentType.GROUP_REQUEST_REJECTED:
           groupRequestStore.removeGroupRequestById(payload.requestId)
           break
         default:
@@ -836,7 +890,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
      *
      * payload 携带变更字段，按非 null 字段直接局部更新；省一次 fetchGroupMemberList 接口
      */
-    handleGroupMemberSettingUpdate(websocketMessage: ImGroupMessageDTO) {
+    handleGroupMemberSettingUpdate(websocketMessage: ImGroupMessageNotification) {
       // content 解析失败由外层 dispatchGroupFrame 的 try-catch 兜底（含 websocketMessage 打印），不重复 catch
       const payload: { silent?: boolean; groupRemark?: string } = JSON.parse(
         websocketMessage.content || '{}'
@@ -937,16 +991,13 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     /**
      * 通话信令分发：1601 RTC_CALL（按 status 区分 INVITING / JOINED / REJECTED / NO_ANSWER / LEFT）+ 1602 / 1603 参与者加入 / 离开
      * <p>
-     * 单一 dispatcher，单次 JSON 解析，mirror handleFriendNotification 的结构
+     * 单一 dispatcher，按 type 分发到 rtcStore
      */
-    handleRtcSignaling(websocketMessage: ImPrivateMessageDTO) {
+    handleRtcSignaling(websocketMessage: ImNoConversationNotification) {
       const rtcStore = useRtcStore()
       switch (websocketMessage.type) {
-        case ImMessageType.RTC_CALL: {
-          const payload = this.safeParse(websocketMessage.content) as ImRtcCallNotification | null
-          if (!payload) {
-            return
-          }
+        case ImContentType.RTC_CALL: {
+          const payload = websocketMessage as unknown as ImRtcCallNotification
           switch (payload.status) {
             case ImRtcParticipantStatus.INVITING:
               if (!isValidRtcInvitePayload(payload)) {
@@ -974,19 +1025,15 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
           }
           return
         }
-        case ImMessageType.RTC_PARTICIPANT_CONNECTED: {
-          const payload = this.safeParse(
-            websocketMessage.content
-          ) as ImRtcParticipantConnectedNotification | null
+        case ImContentType.RTC_PARTICIPANT_CONNECTED: {
+          const payload = websocketMessage as unknown as ImRtcParticipantConnectedNotification
           if (payload?.room && payload.userId) {
             rtcStore.applyParticipantConnected(payload)
           }
           return
         }
-        case ImMessageType.RTC_PARTICIPANT_DISCONNECTED: {
-          const payload = this.safeParse(
-            websocketMessage.content
-          ) as ImRtcParticipantDisconnectedNotification | null
+        case ImContentType.RTC_PARTICIPANT_DISCONNECTED: {
+          const payload = websocketMessage as unknown as ImRtcParticipantDisconnectedNotification
           if (payload?.room && payload.userId) {
             rtcStore.applyParticipantDisconnected(payload)
           }
@@ -1000,7 +1047,9 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
      * 私聊：关闭当前通话窗
      * 群聊：移除胶囊条；如本端在该群通话内则关闭通话窗
      */
-    handleRtcCallEnd(websocketMessage: ImPrivateMessageDTO | ImGroupMessageDTO) {
+    handleRtcCallEnd(
+      websocketMessage: ImPrivateMessageNotification | ImGroupMessageNotification
+    ) {
       const payload = this.safeParse(websocketMessage.content) as ImRtcCallEndNotification | null
       if (!payload?.room) {
         return
@@ -1008,7 +1057,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
       const rtcStore = useRtcStore()
       const isGroup = payload.conversationType === ImConversationType.GROUP
       // 群通话：移除胶囊条（按外层 groupId 取，不依赖 payload）
-      const groupId = (websocketMessage as ImGroupMessageDTO).groupId
+      const groupId = (websocketMessage as ImGroupMessageNotification).groupId
       if (isGroup && groupId) {
         rtcStore.removeGroupCall(groupId)
       }
diff --git a/src/views/im/home/types/index.ts b/src/views/im/home/types/index.ts
index 6ed7c3f58..ecf30c3b8 100644
--- a/src/views/im/home/types/index.ts
+++ b/src/views/im/home/types/index.ts
@@ -6,26 +6,39 @@ export interface WebSocketFrame {
   content: string // 帧内容（JSON 字符串）
 }
 
-// 私聊消息 DTO（对齐后端 ImPrivateMessageDTO）
-export interface ImPrivateMessageDTO {
+// IM WebSocket 通知 DTO（对齐后端 ImNotificationWebSocketDTO）
+export interface ImNotificationWebSocketDTO {
+  conversationType: number // 会话类型
+  contentType: number // 内容类型
+  payload: Record<string, any> // 负载数据
+}
+
+// 无会话在线通知（对齐后端 conversationType = NONE 的独立 payload）
+export interface ImNoConversationNotification {
+  type: number // 内容类型
+  [key: string]: any
+}
+
+// 私聊消息 DTO（对齐后端 ImPrivateMessageNotification）
+export interface ImPrivateMessageNotification {
   id: number // 消息编号
   clientMessageId: string // 客户端消息编号
   senderId: number // 发送人编号
   receiverId: number // 接收人编号
-  type: number // 消息类型
+  type: number // 内容类型
   content: string // 消息内容
   status: number // 消息状态
   receiptStatus?: number // 回执状态（不需要 / 待完成 / 已完成）
   sendTime: string // 发送时间
 }
 
-// 群聊消息 DTO（对齐后端 ImGroupMessageDTO）
-export interface ImGroupMessageDTO {
+// 群聊消息 DTO（对齐后端 ImGroupMessageNotification）
+export interface ImGroupMessageNotification {
   id: number // 消息编号
   clientMessageId: string // 客户端消息编号
   senderId: number // 发送人编号
   groupId: number // 群编号
-  type: number // 消息类型
+  type: number // 内容类型
   content: string // 消息内容
   status: number // 消息状态
   sendTime: string // 发送时间
@@ -36,13 +49,35 @@ export interface ImGroupMessageDTO {
   readId?: number // 已读位置
 }
 
+// 消息已读同步通知（对齐后端 ImMessageReadNotification）
+export interface ImMessageReadNotification {
+  id: number // 已读位置
+  type: number // 内容类型
+  senderId?: number // 发送人编号
+  receiverId?: number // 私聊接收人编号
+  groupId?: number // 群编号
+  channelId?: number // 频道编号
+  readId?: number // 已读位置
+}
+
+// 消息回执通知（对齐后端 ImMessageReceiptNotification）
+export interface ImMessageReceiptNotification {
+  id: number // 消息编号
+  type: number // 内容类型
+  senderId?: number // 已读方用户编号
+  receiverId?: number // 私聊接收人编号
+  groupId?: number // 群编号
+  readCount?: number // 群回执已读人数
+  receiptStatus?: number // 群回执状态
+}
+
 // ==================== 本地会话 / 消息结构 ====================
 
 /** 引用消息 */
 export interface QuoteMessage {
   messageId: number // 引用消息编号
   senderId: number // 引用消息发送人编号
-  type: number // 引用消息类型
+  type: number // 引用内容类型
   content: string // 引用消息内容
 }
 
@@ -61,7 +96,7 @@ export interface Conversation {
   lastContent: string // 会话列表展示的最后一条消息摘要
   lastSendTime: number // 最后一条消息时间，用于排序
   lastSenderId?: number // 发送人编号
-  lastMessageType?: number // 消息类型，对齐 ImMessageType
+  lastMessageType?: number // 内容类型，对齐 ImContentType
   lastMessageId?: number // 最后一条服务端消息编号
   lastClientMessageId?: string // 最后一条客户端消息编号
   lastMessageStatus?: number // 最后一条消息状态
@@ -84,10 +119,10 @@ export interface Conversation {
 
 // 消息数据结构
 export interface Message {
-  // ========== 后端字段（对齐 ImPrivateMessageDTO / ImGroupMessageDTO） ==========
+  // ========== 后端字段（对齐 ImPrivateMessageNotification / ImGroupMessageNotification） ==========
   id?: number // 服务端消息编号，发送中为空
   clientMessageId: string // 客户端消息编号，本地生成用于合并去重
-  type: number // 消息类型，对齐 ImMessageType
+  type: number // 内容类型，对齐 ImContentType
   content: string // 消息内容，JSON 字符串
   status: number // 消息状态，对齐 ImMessageStatus
   sendTime: number // 发送时间（前端转毫秒时间戳；后端为 LocalDateTime 字符串）
diff --git a/src/views/im/manager/message/MessageContentPreview.vue b/src/views/im/manager/message/MessageContentPreview.vue
index fbb0078d4..70fa2ef39 100644
--- a/src/views/im/manager/message/MessageContentPreview.vue
+++ b/src/views/im/manager/message/MessageContentPreview.vue
@@ -85,19 +85,19 @@
 
   <!-- 控制类消息：撤回 / 已读 / 回执 -->
   <span
-    v-else-if="props.type === ImMessageType.RECALL"
+    v-else-if="props.type === ImContentType.RECALL"
     class="text-12px text-[var(--el-text-color-secondary)]"
   >
     [消息已撤回]
   </span>
   <span
-    v-else-if="props.type === ImMessageType.READ"
+    v-else-if="props.type === ImContentType.READ"
     class="text-12px text-[var(--el-text-color-secondary)]"
   >
     [已读回执]
   </span>
   <span
-    v-else-if="props.type === ImMessageType.RECEIPT"
+    v-else-if="props.type === ImContentType.RECEIPT"
     class="text-12px text-[var(--el-text-color-secondary)]"
   >
     [回执]
@@ -139,7 +139,7 @@ import { formatFileSize } from '@/utils/file'
 import { formatSeconds } from '@/utils/formatTime'
 import { DICT_TYPE, getDictLabel } from '@/utils/dict'
 import {
-  ImMessageType,
+  ImContentType,
   ImRtcCallEndReason,
   ImRtcCallMediaType,
   isFriendChatTip,
@@ -169,7 +169,7 @@ import { openSafeUrl } from '@/utils/url'
 defineOptions({ name: 'ImMessageContentPreview' })
 
 const props = defineProps<{
-  /** 消息类型，对应 ImMessageType */
+  /** 内容类型，对应 ImContentType */
   type?: number
   /** 消息 content（JSON 字符串或裸文本） */
   content?: string
@@ -178,14 +178,14 @@ const props = defineProps<{
 }>()
 
 /** 各类型判定 */
-const isText = computed(() => props.type === ImMessageType.TEXT)
-const isImage = computed(() => props.type === ImMessageType.IMAGE)
-const isFile = computed(() => props.type === ImMessageType.FILE)
-const isVoice = computed(() => props.type === ImMessageType.VOICE)
-const isVideo = computed(() => props.type === ImMessageType.VIDEO)
-const isCard = computed(() => props.type === ImMessageType.CARD)
-const isFace = computed(() => props.type === ImMessageType.FACE)
-const isMerge = computed(() => props.type === ImMessageType.MERGE)
+const isText = computed(() => props.type === ImContentType.TEXT)
+const isImage = computed(() => props.type === ImContentType.IMAGE)
+const isFile = computed(() => props.type === ImContentType.FILE)
+const isVoice = computed(() => props.type === ImContentType.VOICE)
+const isVideo = computed(() => props.type === ImContentType.VIDEO)
+const isCard = computed(() => props.type === ImContentType.CARD)
+const isFace = computed(() => props.type === ImContentType.FACE)
+const isMerge = computed(() => props.type === ImContentType.MERGE)
 
 /** 文本内容：从 TextMessage payload 取 .content */
 const textContent = computed(
@@ -278,7 +278,7 @@ const rtcCallTipText = computed(() => {
     return ''
   }
   const mediaLabel = payload.mediaType === ImRtcCallMediaType.VIDEO ? '视频' : '语音'
-  if (props.type === ImMessageType.RTC_CALL_START) {
+  if (props.type === ImContentType.RTC_CALL_START) {
     const inviter = payload.inviterNickname?.trim() || `用户(${payload.inviterUserId ?? ''})`
     return `${inviter} 发起了${mediaLabel}通话`
   }
diff --git a/src/views/im/manager/message/group/GroupMessageDetail.vue b/src/views/im/manager/message/group/GroupMessageDetail.vue
index 792f689fb..fe58d16ba 100644
--- a/src/views/im/manager/message/group/GroupMessageDetail.vue
+++ b/src/views/im/manager/message/group/GroupMessageDetail.vue
@@ -10,7 +10,7 @@
         {{ detail.senderNickname }} ({{ detail.senderId }})
       </el-descriptions-item>
       <el-descriptions-item label="类型">
-        <dict-tag :type="DICT_TYPE.IM_MESSAGE_TYPE" :value="detail.type" />
+        <dict-tag :type="DICT_TYPE.IM_CONTENT_TYPE" :value="detail.type" />
       </el-descriptions-item>
       <el-descriptions-item v-if="MESSAGE_GROUP_READ_ENABLED" label="状态">
         <dict-tag :type="DICT_TYPE.IM_MESSAGE_STATUS" :value="detail.status" />
diff --git a/src/views/im/manager/message/group/index.vue b/src/views/im/manager/message/group/index.vue
index 94326f7a9..6bfe9821d 100644
--- a/src/views/im/manager/message/group/index.vue
+++ b/src/views/im/manager/message/group/index.vue
@@ -18,15 +18,15 @@
           class="!w-240px"
         />
       </el-form-item>
-      <el-form-item label="消息类型" prop="type">
+      <el-form-item label="内容类型" prop="type">
         <el-select
           v-model="queryParams.type"
-          placeholder="请选择消息类型"
+          placeholder="请选择内容类型"
           clearable
           class="!w-240px"
         >
           <el-option
-            v-for="dict in getIntDictOptions(DICT_TYPE.IM_MESSAGE_TYPE)"
+            v-for="dict in getIntDictOptions(DICT_TYPE.IM_CONTENT_TYPE)"
             :key="dict.value"
             :label="dict.label"
             :value="dict.value"
@@ -78,7 +78,7 @@
       </el-table-column>
       <el-table-column label="类型" align="center" prop="type" width="100">
         <template #default="{ row }">
-          <dict-tag :type="DICT_TYPE.IM_MESSAGE_TYPE" :value="row.type" />
+          <dict-tag :type="DICT_TYPE.IM_CONTENT_TYPE" :value="row.type" />
         </template>
       </el-table-column>
       <el-table-column
diff --git a/src/views/im/manager/message/private/PrivateMessageDetail.vue b/src/views/im/manager/message/private/PrivateMessageDetail.vue
index 4c7cd2126..a7be49246 100644
--- a/src/views/im/manager/message/private/PrivateMessageDetail.vue
+++ b/src/views/im/manager/message/private/PrivateMessageDetail.vue
@@ -12,7 +12,7 @@
         {{ detail.receiverNickname }} ({{ detail.receiverId }})
       </el-descriptions-item>
       <el-descriptions-item label="类型">
-        <dict-tag :type="DICT_TYPE.IM_MESSAGE_TYPE" :value="detail.type" />
+        <dict-tag :type="DICT_TYPE.IM_CONTENT_TYPE" :value="detail.type" />
       </el-descriptions-item>
       <el-descriptions-item v-if="MESSAGE_PRIVATE_READ_ENABLED" label="状态">
         <dict-tag :type="DICT_TYPE.IM_MESSAGE_STATUS" :value="detail.status" />
diff --git a/src/views/im/manager/message/private/index.vue b/src/views/im/manager/message/private/index.vue
index a5bd7a40a..809522bd3 100644
--- a/src/views/im/manager/message/private/index.vue
+++ b/src/views/im/manager/message/private/index.vue
@@ -22,15 +22,15 @@
           class="!w-240px"
         />
       </el-form-item>
-      <el-form-item label="消息类型" prop="type">
+      <el-form-item label="内容类型" prop="type">
         <el-select
           v-model="queryParams.type"
-          placeholder="请选择消息类型"
+          placeholder="请选择内容类型"
           clearable
           class="!w-240px"
         >
           <el-option
-            v-for="dict in getIntDictOptions(DICT_TYPE.IM_MESSAGE_TYPE)"
+            v-for="dict in getIntDictOptions(DICT_TYPE.IM_CONTENT_TYPE)"
             :key="dict.value"
             :label="dict.label"
             :value="dict.value"
@@ -82,7 +82,7 @@
       </el-table-column>
       <el-table-column label="类型" align="center" prop="type" width="100">
         <template #default="{ row }">
-          <dict-tag :type="DICT_TYPE.IM_MESSAGE_TYPE" :value="row.type" />
+          <dict-tag :type="DICT_TYPE.IM_CONTENT_TYPE" :value="row.type" />
         </template>
       </el-table-column>
       <el-table-column label="内容预览" align="left" min-width="240">
diff --git a/src/views/im/manager/statistics/components/MessageTypeChart.vue b/src/views/im/manager/statistics/components/MessageTypeChart.vue
index 29872df7a..52aa297ea 100644
--- a/src/views/im/manager/statistics/components/MessageTypeChart.vue
+++ b/src/views/im/manager/statistics/components/MessageTypeChart.vue
@@ -1,6 +1,6 @@
 <template>
   <el-card shadow="never" class="!rounded-8px mb-16px">
-    <template #header>消息类型分布</template>
+    <template #header>内容类型分布</template>
     <div ref="chartRef" v-loading="loading" style="width: 100%; height: 320px"></div>
   </el-card>
 </template>
@@ -19,7 +19,7 @@ let chart: echarts.ECharts | null = null
 /** 渲染饼图：type 在前端按字典翻译为名称给 echarts */
 const render = (data: StatisticsApi.ImStatisticsMessageTypeVO[]) => {
   const items = data.map((d) => ({
-    name: getDictLabel(DICT_TYPE.IM_MESSAGE_TYPE, d.type) || `未知(${d.type})`,
+    name: getDictLabel(DICT_TYPE.IM_CONTENT_TYPE, d.type) || `未知(${d.type})`,
     value: d.value
   }))
   chart?.setOption({
diff --git a/src/views/im/utils/constants.ts b/src/views/im/utils/constants.ts
index 91ee871a4..03556b1d0 100644
--- a/src/views/im/utils/constants.ts
+++ b/src/views/im/utils/constants.ts
@@ -1,5 +1,5 @@
-/** IM 消息类型枚举（对齐后端 ImMessageTypeEnum） */
-export const ImMessageType = {
+/** IM 内容类型枚举（对齐后端 ImContentTypeEnum） */
+export const ImContentType = {
   // ========== 用户聊天消息（101-105 直接复用 OpenIM 段位编号） ==========
   TEXT: 101, // 文本（对应 OpenIM Text=101）
   IMAGE: 102, // 图片（对应 OpenIM Picture=102）
@@ -64,75 +64,75 @@ export const ImMessageType = {
 /** 判断是否「群广播事件」：[GROUP_CREATE, GROUP_BANNED] 段位都算，仅 GROUP_MEMBER_SETTING_UPDATE 是个人信号排除 */
 export function isGroupNotification(type: number): boolean {
   return (
-    type >= ImMessageType.GROUP_CREATE
-    && type <= ImMessageType.GROUP_BANNED
-    && type !== ImMessageType.GROUP_MEMBER_SETTING_UPDATE
+    type >= ImContentType.GROUP_CREATE &&
+    type <= ImContentType.GROUP_BANNED &&
+    type !== ImContentType.GROUP_MEMBER_SETTING_UPDATE
   )
 }
 
 /** 判断是否「好友通知事件」：1201-1210 段位 */
 export function isFriendNotification(type: number): boolean {
-  return type >= ImMessageType.FRIEND_REQUEST_APPROVED && type <= ImMessageType.FRIEND_UPDATE
+  return type >= ImContentType.FRIEND_REQUEST_APPROVED && type <= ImContentType.FRIEND_UPDATE
 }
 
-/** 判断是否「加群申请通知事件」：1503/1505/1506 走私聊通道，按段位识别 */
+/** 判断是否「加群申请通知事件」：1503/1505/1506 */
 export function isGroupRequestNotification(type: number): boolean {
   return (
-    type === ImMessageType.GROUP_REQUEST_RECEIVED
-    || type === ImMessageType.GROUP_REQUEST_APPROVED
-    || type === ImMessageType.GROUP_REQUEST_REJECTED
+    type === ImContentType.GROUP_REQUEST_RECEIVED ||
+    type === ImContentType.GROUP_REQUEST_APPROVED ||
+    type === ImContentType.GROUP_REQUEST_REJECTED
   )
 }
 
 /** 判断是否「会话内的好友事件气泡」：FRIEND_ADD / FRIEND_DELETE 直接渲染成灰色提示，与群事件同处理 */
 export function isFriendChatTip(type: number): boolean {
-  return type === ImMessageType.FRIEND_ADD || type === ImMessageType.FRIEND_DELETE
+  return type === ImContentType.FRIEND_ADD || type === ImContentType.FRIEND_DELETE
 }
 
 /** 判断是否「会话内的通话事件气泡」：RTC_CALL_START / RTC_CALL_END 渲染成灰色提示 */
 export function isRtcCallTip(type: number): boolean {
-  return type === ImMessageType.RTC_CALL_START || type === ImMessageType.RTC_CALL_END
+  return type === ImContentType.RTC_CALL_START || type === ImContentType.RTC_CALL_END
 }
 
 /**
- * IM 普通消息类型集合（normal vs event 二分；与后端 ImMessageTypeEnum.normal 字段语义一致）
+ * IM 普通内容类型集合（normal vs event 二分；与后端 ImContentTypeEnum.normal 字段语义一致）
  *
  * 这个集合在多处被复用，新增类型前先确认所有副作用都符合预期：
- * 1. 后端发送入口校验（Im{Private,Group}MessageSendReqVO.isNormalType）—— 用户发送的消息类型必须 normal=true
+ * 1. 后端发送入口校验（Im{Private,Group}MessageSendReqVO.isNormalType）—— 用户发送的内容类型必须 normal=true
  * 2. 前端接收侧未读 / 提示音（websocketStore）—— normal 消息计入会话未读数 + 触发声音
  * 3. 前端会话列表 lastType / @ 标签（ConversationItem）—— 只有 normal 才算「最后一条聊天消息」
  * 4. 前端群消息置顶菜单（MessageItem.vue 的 canPin）—— normal 才允许群主 / 管理员置顶
  *
  * 名片（CARD）/ 表情（FACE）都是「用户主动发的聊天消息」，1/2/3 都符合预期；4 同时放开 = 群主可置顶，语义合理
  */
-const ImMessageTypeNormals: number[] = [
-  ImMessageType.TEXT,
-  ImMessageType.IMAGE,
-  ImMessageType.FILE,
-  ImMessageType.VOICE,
-  ImMessageType.VIDEO,
-  ImMessageType.CARD,
-  ImMessageType.FACE,
-  ImMessageType.MERGE,
-  ImMessageType.MATERIAL // 频道素材计入未读数 + 进会话列表
+const ImContentTypeNormals: number[] = [
+  ImContentType.TEXT,
+  ImContentType.IMAGE,
+  ImContentType.FILE,
+  ImContentType.VOICE,
+  ImContentType.VIDEO,
+  ImContentType.CARD,
+  ImContentType.FACE,
+  ImContentType.MERGE,
+  ImContentType.MATERIAL // 频道素材计入未读数 + 进会话列表
 ]
 
 /** 判断是否"普通消息" */
 export function isNormalMessage(type: number): boolean {
-  return ImMessageTypeNormals.includes(type)
+  return ImContentTypeNormals.includes(type)
 }
 
-/** IM 媒体消息类型集合：发送依赖本地 File 上传，刷新后 _localFile 丢失即不可恢复 */
-const ImMessageTypeMedia: number[] = [
-  ImMessageType.IMAGE,
-  ImMessageType.FILE,
-  ImMessageType.VOICE,
-  ImMessageType.VIDEO
+/** IM 媒体内容类型集合：发送依赖本地 File 上传，刷新后 _localFile 丢失即不可恢复 */
+const ImContentTypeMedia: number[] = [
+  ImContentType.IMAGE,
+  ImContentType.FILE,
+  ImContentType.VOICE,
+  ImContentType.VIDEO
 ]
 
 /** 判断是否「媒体消息」：图片 / 文件 / 语音 / 视频 */
 export function isMediaMessageType(type: number): boolean {
-  return ImMessageTypeMedia.includes(type)
+  return ImContentTypeMedia.includes(type)
 }
 
 /**
@@ -149,6 +149,7 @@ export const ImMessageStatus = {
 
 /** IM 会话类型枚举 */
 export const ImConversationType = {
+  NONE: 0, // 无会话
   PRIVATE: 1, // 私聊
   GROUP: 2, // 群聊
   CHANNEL: 3 // 频道 / 公众号
@@ -225,11 +226,9 @@ export const ImRtcCallStage = {
 /** ImRtcCallStage 取值类型 */
 export type ImRtcCallStageValue = (typeof ImRtcCallStage)[keyof typeof ImRtcCallStage]
 
-/** IM WebSocket 外层帧类型（对齐后端 ImPrivateMessageDTO.TYPE / ImGroupMessageDTO.TYPE / ImChannelMessageDTO.TYPE） */
+/** IM WebSocket 外层帧类型 */
 export const ImWebSocketMessageType = {
-  PRIVATE_MESSAGE: 'im-private-message', // 私聊通道
-  GROUP_MESSAGE: 'im-group-message', // 群聊通道
-  CHANNEL_MESSAGE: 'im-channel-message' // 频道通道
+  NOTIFICATION: 'im-notification' // IM 通知
 } as const
 
 /** IM 消息回执状态枚举（对齐后端 ImMessageReceiptStatusEnum） */
diff --git a/src/views/im/utils/conversation.ts b/src/views/im/utils/conversation.ts
index 0c180b2ae..96f7e8e19 100644
--- a/src/views/im/utils/conversation.ts
+++ b/src/views/im/utils/conversation.ts
@@ -6,7 +6,7 @@
 // 2. fallbackName 由调用方传入（典型来源：Conversation.lastSenderDisplayName 快照），透传到 getSenderDisplayName 内部，算不出真名时兜底
 // ====================================================================
 
-import { ImConversationType, ImMessageType, isFriendChatTip, isGroupNotification, isRtcCallTip } from './constants'
+import { ImConversationType, ImContentType, isFriendChatTip, isGroupNotification, isRtcCallTip } from './constants'
 import {
   getCardLabelInfo,
   parseMessage,
@@ -103,47 +103,47 @@ export function summarizeMessageContent(
   opts?: { withFileName?: boolean }
 ): string {
   switch (message.type) {
-    case ImMessageType.TEXT:
+    case ImContentType.TEXT:
       return parseMessage<TextMessage>(message.content)?.content ?? ''
-    case ImMessageType.IMAGE:
+    case ImContentType.IMAGE:
       return '[图片]'
-    case ImMessageType.VOICE:
+    case ImContentType.VOICE:
       return '[语音]'
-    case ImMessageType.VIDEO:
+    case ImContentType.VIDEO:
       return '[视频]'
-    case ImMessageType.FILE: {
+    case ImContentType.FILE: {
       if (opts?.withFileName) {
         const file = parseMessage<FileMessage>(message.content)
         return file?.name ? `[文件] ${file.name}` : '[文件]'
       }
       return '[文件]'
     }
-    case ImMessageType.CARD:
+    case ImContentType.CARD:
       return `[${getCardLabelInfo(parseMessage<CardMessage>(message.content)).label}]`
-    case ImMessageType.FACE:
+    case ImContentType.FACE:
       return buildFacePreviewText(parseMessage<FaceMessage>(message.content))
-    case ImMessageType.MERGE:
+    case ImContentType.MERGE:
       return '[聊天记录]'
-    case ImMessageType.MATERIAL: {
+    case ImContentType.MATERIAL: {
       const material = parseMessage<MaterialMessage>(message.content)
       return material?.title ? `[频道] ${material.title}` : '[频道]'
     }
-    case ImMessageType.RTC_CALL_START:
-    case ImMessageType.RTC_CALL_END:
+    case ImContentType.RTC_CALL_START:
+    case ImContentType.RTC_CALL_END:
       return '[语音通话]'
     default:
       return ''
   }
 }
 
-/** 会话列表最后一条摘要：RECALL 走 buildRecallTip + fallbackName；其它按消息类型派生 */
+/** 会话列表最后一条摘要：RECALL 走 buildRecallTip + fallbackName；其它按内容类型派生 */
 export function resolveConversationLastContent(
   message: Message,
   conversationType: number,
   conversationTargetId: number,
   fallbackName?: string
 ): string {
-  if (message.type === ImMessageType.RECALL) {
+  if (message.type === ImContentType.RECALL) {
     return buildRecallTip(
       message.senderId,
       message.selfSend,
diff --git a/src/views/im/utils/emoji.ts b/src/views/im/utils/emoji.ts
index a14f56cc9..2a25315e8 100644
--- a/src/views/im/utils/emoji.ts
+++ b/src/views/im/utils/emoji.ts
@@ -2,7 +2,7 @@
  * IM 常用 Unicode emoji 列表
  *
  * 所见即所得（不依赖图片资源），由表情面板（FacePicker 的 emoji tab）使用；
- * Unicode emoji 选中后由调用方插入到输入框走 TEXT 通道，不走 FACE 消息类型
+ * Unicode emoji 选中后由调用方插入到输入框走 TEXT 通道，不走 FACE 内容类型
  */
 export const IM_EMOJI_LIST: string[] = [
   '😀', '😁', '😂', '🤣', '😃', '😄', '😅', '😆', '😉', '😊',
diff --git a/src/views/im/utils/message.ts b/src/views/im/utils/message.ts
index 42c0527fe..eae2f1553 100644
--- a/src/views/im/utils/message.ts
+++ b/src/views/im/utils/message.ts
@@ -3,7 +3,7 @@ import { useUserStore } from '@/store/modules/user'
 import {
   ImRtcCallEndReason,
   ImConversationType,
-  ImMessageType,
+  ImContentType,
   type ImConversationTypeValue
 } from './constants'
 import { getCurrentUserId } from '@/utils/auth'
@@ -18,7 +18,7 @@ export type { QuoteMessage } from '../home/types'
 // IM 消息 content 编解码 & 展示工具
 // ====================================================================
 // 约定：消息的 content 字段统一存 JSON 字符串，字段名、结构对齐后端
-// cn.iocoder.yudao.module.im.service.websocket.dto.message.* 下的 DTO。
+// cn.iocoder.yudao.module.im.service.websocket.notification.message.* 下的 DTO。
 // 各类消息 payload interface 字段对齐后端；解析统一用 parseMessage<T>，
 // 序列化直接 JSON.stringify(payload)。
 // ====================================================================
@@ -204,7 +204,7 @@ export interface ImageMessage extends Quotable {
   size?: number
 }
 
-/** 语音消息 payload（对齐后端 AudioMessage；ImMessageType 保留 VOICE 命名） */
+/** 语音消息 payload（对齐后端 AudioMessage；ImContentType 保留 VOICE 命名） */
 export interface AudioMessage extends Quotable {
   url: string
   /** 时长（秒） */
@@ -324,7 +324,7 @@ export interface MergeMessageItem {
   senderNickname: string
   /** 发送人头像快照 */
   senderAvatar?: string
-  /** 消息类型，对齐 ImMessageType */
+  /** 内容类型，对齐 ImContentType */
   type: number
   /** 原消息 content（JSON）；嵌套合并消息时仍按本结构层层展开 */
   content: string
@@ -449,19 +449,19 @@ export interface AddableFacePayload {
 }
 
 /**
- * 从消息抽取「添加到表情」的 payload；当前消息类型不可添加返回 null
+ * 从消息抽取「添加到表情」的 payload；当前内容类型不可添加返回 null
  *
  * 调用方（MessageItem 的右键菜单）按 nullable 决定是否展示「添加到表情」入口
  */
 export function extractAddableFace(message: Message): AddableFacePayload | null {
-  if (message.type === ImMessageType.FACE) {
+  if (message.type === ImContentType.FACE) {
     const face = parseMessage<FaceMessage>(message.content)
     if (!face?.url) {
       return null
     }
     return { url: face.url, width: face.width || 200, height: face.height || 200, name: face.name }
   }
-  if (message.type === ImMessageType.IMAGE) {
+  if (message.type === ImContentType.IMAGE) {
     const image = parseMessage<ImageMessage>(message.content)
     if (!image?.url) {
       return null
@@ -718,7 +718,7 @@ export function resolveGroupNotificationSegments(
     return []
   }
   // ENTER 主语是 entrant 而非 operator，独立处理；其它 case 都以 operatorUserId 为主语
-  if (message.type === ImMessageType.GROUP_MEMBER_ENTER) {
+  if (message.type === ImContentType.GROUP_MEMBER_ENTER) {
     const entrantId = payload.entrantUserId ?? payload.operatorUserId
     return entrantId ? [tipMention(entrantId, resolveName(entrantId)), tipText(' 加入了群聊')] : []
   }
@@ -732,31 +732,31 @@ export function resolveGroupNotificationSegments(
   const memberSegments = joinMentionSegments(payload.memberUserIds || [], '、', resolveName)
 
   switch (message.type) {
-    case ImMessageType.GROUP_CREATE:
+    case ImContentType.GROUP_CREATE:
       return [operatorSegment, tipText(' 创建了群聊')]
-    case ImMessageType.GROUP_NAME_UPDATE:
+    case ImContentType.GROUP_NAME_UPDATE:
       return [operatorSegment, tipText(` 将群名修改为 "${payload.newName ?? ''}"`)]
-    case ImMessageType.GROUP_NOTICE_UPDATE:
+    case ImContentType.GROUP_NOTICE_UPDATE:
       return [operatorSegment, tipText(' 更新了群公告')]
-    case ImMessageType.GROUP_INFO_UPDATE:
+    case ImContentType.GROUP_INFO_UPDATE:
       return payload.newAvatar
         ? [operatorSegment, tipText(' 更换了群头像')]
         : [operatorSegment, tipText(' 更新了群信息')]
-    case ImMessageType.GROUP_DISSOLVE:
+    case ImContentType.GROUP_DISSOLVE:
       return [operatorSegment, tipText(' 解散了群聊')]
-    case ImMessageType.GROUP_MEMBER_INVITE:
+    case ImContentType.GROUP_MEMBER_INVITE:
       return [operatorSegment, tipText(' 邀请 '), ...memberSegments, tipText(' 加入群聊')]
-    case ImMessageType.GROUP_MEMBER_QUIT:
+    case ImContentType.GROUP_MEMBER_QUIT:
       return [operatorSegment, tipText(' 退出了群聊')]
-    case ImMessageType.GROUP_MEMBER_KICK:
+    case ImContentType.GROUP_MEMBER_KICK:
       return [operatorSegment, tipText(' 移出了 '), ...memberSegments]
-    case ImMessageType.GROUP_MEMBER_NICKNAME_UPDATE:
+    case ImContentType.GROUP_MEMBER_NICKNAME_UPDATE:
       return [operatorSegment, tipText(` 修改群昵称为 "${payload.displayUserName ?? ''}"`)]
-    case ImMessageType.GROUP_ADMIN_ADD:
+    case ImContentType.GROUP_ADMIN_ADD:
       return [operatorSegment, tipText(' 将 '), ...memberSegments, tipText(' 设为管理员')]
-    case ImMessageType.GROUP_ADMIN_REMOVE:
+    case ImContentType.GROUP_ADMIN_REMOVE:
       return [operatorSegment, tipText(' 撤销了 '), ...memberSegments, tipText(' 的管理员身份')]
-    case ImMessageType.GROUP_OWNER_TRANSFER:
+    case ImContentType.GROUP_OWNER_TRANSFER:
       return payload.newOwnerUserId
         ? [
             operatorSegment,
@@ -764,11 +764,11 @@ export function resolveGroupNotificationSegments(
             tipMention(payload.newOwnerUserId, resolveName(payload.newOwnerUserId))
           ]
         : []
-    case ImMessageType.GROUP_MESSAGE_PIN:
+    case ImContentType.GROUP_MESSAGE_PIN:
       return [operatorSegment, tipText(' 置顶了一条消息')]
-    case ImMessageType.GROUP_MESSAGE_UNPIN:
+    case ImContentType.GROUP_MESSAGE_UNPIN:
       return [operatorSegment, tipText(' 取消了一条置顶消息')]
-    case ImMessageType.GROUP_MEMBER_MUTED:
+    case ImContentType.GROUP_MEMBER_MUTED:
       return payload.mutedUserId
         ? [
             operatorSegment,
@@ -777,7 +777,7 @@ export function resolveGroupNotificationSegments(
             tipText(' 禁言')
           ]
         : []
-    case ImMessageType.GROUP_MEMBER_CANCEL_MUTED:
+    case ImContentType.GROUP_MEMBER_CANCEL_MUTED:
       return payload.mutedUserId
         ? [
             operatorSegment,
@@ -786,11 +786,11 @@ export function resolveGroupNotificationSegments(
             tipText(' 的禁言')
           ]
         : []
-    case ImMessageType.GROUP_MUTED:
+    case ImContentType.GROUP_MUTED:
       return [operatorSegment, tipText(' 开启了全群禁言')]
-    case ImMessageType.GROUP_CANCEL_MUTED:
+    case ImContentType.GROUP_CANCEL_MUTED:
       return [operatorSegment, tipText(' 关闭了全群禁言')]
-    case ImMessageType.GROUP_BANNED:
+    case ImContentType.GROUP_BANNED:
       return [operatorSegment, tipText(payload.banned ? ' 封禁了该群' : ' 解封了该群')]
     default:
       return []
@@ -813,9 +813,9 @@ export function resolveGroupNotificationText(
 /** 会话内好友事件 segments */
 export function resolveFriendNotificationSegments(message: { type?: number }): TipSegment[] {
   switch (message.type) {
-    case ImMessageType.FRIEND_ADD:
+    case ImContentType.FRIEND_ADD:
       return [tipText('你们已经是好友了，开始聊天吧')]
-    case ImMessageType.FRIEND_DELETE:
+    case ImContentType.FRIEND_DELETE:
       return [tipText('你已删除好友')]
     default:
       return []
@@ -874,7 +874,7 @@ export function resolveRtcCallTipSegments(message: {
   if (!payload) {
     return []
   }
-  if (message.type === ImMessageType.RTC_CALL_START) {
+  if (message.type === ImContentType.RTC_CALL_START) {
     return payload.inviterUserId
       ? [
           tipMention(payload.inviterUserId, resolveRtcInviterLabel(payload)),
@@ -882,7 +882,7 @@ export function resolveRtcCallTipSegments(message: {
         ]
       : []
   }
-  if (message.type === ImMessageType.RTC_CALL_END) {
+  if (message.type === ImContentType.RTC_CALL_END) {
     return [tipText('语音通话已经结束')]
   }
   return []
@@ -907,10 +907,10 @@ export function resolveRtcCallLastContent(
   if (conversationType === ImConversationType.PRIVATE) {
     return '[语音通话]'
   }
-  if (message.type === ImMessageType.RTC_CALL_END) {
+  if (message.type === ImContentType.RTC_CALL_END) {
     return '语音通话已经结束'
   }
-  if (message.type === ImMessageType.RTC_CALL_START) {
+  if (message.type === ImContentType.RTC_CALL_START) {
     const payload = parseRtcCallPayload(message.content)
     if (payload) {
       return `${resolveRtcInviterLabel(payload)} 发起了语音通话`