fix(im)：群昵称修改改为静默同步

- 后端将 GROUP_MEMBER_NICKNAME_UPDATE 改为非持久化事件，避免写入群聊历史消息
- 保留群昵称变更的 WebSocket 在线同步，继续更新成员 displayUserName
- Vue3 聊天侧栏从当前群成员的 displayUserName 回填「我在本群的昵称」
- Vue3 WebSocket 收到 GROUP_MEMBER_NICKNAME_UPDATE 时只同步 groupStore，不再插入消息列表
- 补充后端单测，覆盖群昵称变更事件不入库但仍推送

src/views/im/home/pages/conversation/components/message/MessagePanel.vue

@@ -259,6 +259,7 @@ import { createCall } from '@/api/im/rtc'
 import { ImRtcCallMediaType, ImRtcCallStatus, ImConversationType } from '@/views/im/utils/constants'
 import { resolveCallEndReasonText } from '@/views/im/utils/message'
 import { getClientConversationId } from '@/views/im/utils/db'
+import { getCurrentUserId } from '@/utils/auth'
 import { useRtcStore } from '../../../../store/rtcStore'
 import { useMessageStore } from '../../../../store/messageStore'
 
@@ -403,12 +404,14 @@ const groupInfo = computed<
     return undefined
   }
   const group = groupStore.getGroup(conversation.targetId)
+  const selfMember = group?.members?.find((member) => member.userId === getCurrentUserId())
   return {
     id: conversation.targetId,
     name: group?.name || conversation.name,
     showGroupName: group?.name || conversation.name,
     showImage: group?.avatar || conversation.avatar,
     notice: group?.notice,
+    remarkNickName: selfMember?.displayUserName,
     groupRemark: group?.groupRemark,
     ownerId: group?.ownerUserId,
     memberCount: group?.memberCount,

src/views/im/home/store/websocketStore.ts

@@ -171,6 +171,7 @@ const convertGroupMessage = (
  *    - 已读 / 回执（READ / RECEIPT）：多端已读同步、对方读后回执
  *    - 好友变更（FRIEND_*）：同步 friendStore + 级联刷新私聊会话；FRIEND_ADD / FRIEND_DELETE 额外插入会话气泡
  *    - 群个人信号（GROUP_MEMBER_SETTING_UPDATE）：同步 groupStore + 级联刷新群聊会话
+ *    - 群成员昵称变更（GROUP_MEMBER_NICKNAME_UPDATE）：同步 groupStore，不插入消息列表
  *    - 群广播事件（GROUP_*）：走 handleGroupMessage + applyGroupNotification 旁路（含 DISSOLVE / QUIT / KICK 自判清群）
  */
 export const useImWebSocketStore = defineStore('imWebSocketStore', {
@@ -496,7 +497,7 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
     /**
      * 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
+     * GROUP_MEMBER_SETTING_UPDATE / GROUP_MEMBER_NICKNAME_UPDATE 是成员资料同步信号；其它群广播事件走 handleGroupMessage 入库 + 触发 applyGroupNotification 旁路
      */
     dispatchGroupFrame(websocketMessage: ImGroupMessageNotification) {
       try {
@@ -510,6 +511,9 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
           case ImContentType.GROUP_MEMBER_SETTING_UPDATE:
             this.handleGroupMemberSettingUpdate(websocketMessage)
             break
+          case ImContentType.GROUP_MEMBER_NICKNAME_UPDATE:
+            this.handleGroupMemberNicknameUpdate(websocketMessage)
+            break
           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))
@@ -921,6 +925,15 @@ export const useImWebSocketStore = defineStore('imWebSocketStore', {
       }
     },
 
+    /** GROUP_MEMBER_NICKNAME_UPDATE：同步成员在群里的昵称 */
+    handleGroupMemberNicknameUpdate(websocketMessage: ImGroupMessageNotification) {
+      useGroupStore().applyGroupNotification(
+        websocketMessage.groupId,
+        websocketMessage.type,
+        websocketMessage.content
+      )
+    },
+
     // ==================== 心跳 / 重连 ====================
 
     /** 心跳包：纯文本 'ping'，对应服务端 'pong'（后端这层用纯字符串约定，避免 JSON 解析开销） */

src/views/im/utils/db.ts

@@ -202,7 +202,25 @@ function guardSession(session: number) {
 
 /** 克隆可入库对象 */
 function toDbValue<T>(value: T): T {
-  return toRaw(value) as T
+  return cloneDbValue(value) as T
+}
+
+/** 转换为 IndexedDB 可克隆对象 */
+function cloneDbValue(value: unknown): unknown {
+  const raw = toRaw(value)
+  if (Array.isArray(raw)) {
+    return raw.map((item) => cloneDbValue(item))
+  }
+  if (!raw || typeof raw !== 'object') {
+    return raw
+  }
+  const prototype = Object.getPrototypeOf(raw)
+  if (prototype !== Object.prototype && prototype !== null) {
+    return raw
+  }
+  return Object.fromEntries(
+    Object.entries(raw as Record<string, unknown>).map(([key, item]) => [key, cloneDbValue(item)])
+  )
 }
 
 class DbClient {