fix(im)：加固好友、群成员与群消息边界流程

- 清理好友重加时的 deleteTime 和历史备注残留
- 清理群成员重入时的 quitTime、muteEndTime 和邀请来源残留
- 允许封禁群成员主动退群，仍拦截已解散群
- 校验群已读游标的消息归属和可见性
- 收窄群消息置顶通知为专用展示对象并同步前端展示
- 回填群成员单查接口的昵称和头像
- 补充相关回归测试并流转 IM bug 状态文档

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

@@ -14,7 +14,12 @@ import {
 } from '@/api/im/group/member'
 import { useConversationStore } from './conversationStore'
 import { useGroupRequestStore } from './groupRequestStore'
-import { ImConversationType, ImGroupMemberRole, ImMessageType } from '../../utils/constants'
+import {
+  ImConversationType,
+  ImGroupMemberRole,
+  ImMessageStatus,
+  ImMessageType
+} from '../../utils/constants'
 import { CommonStatusEnum } from '@/utils/constants'
 import {
   getCurrentUserId,
@@ -700,7 +705,7 @@ export const useGroupStore = defineStore('imGroupStore', {
       }
     },
 
-    /** 群消息置顶：从 payload 直接拿完整消息对象 push 到 pinnedMessages */
+    /** 群消息置顶：从 payload 取消息展示数据加入置顶列表 */
     applyGroupMessagePinNotification(groupId: number, payload: GroupNotificationPayload) {
       const message = payload.message
       if (!message) {
@@ -715,17 +720,22 @@ export const useGroupStore = defineStore('imGroupStore', {
       if (existing.some((msg) => msg.id === message.id)) {
         return
       }
-      // message 字段名跟 Message 一致（仅 sendTime 需要从 ISO 串转毫秒戳，selfSend 按当前用户算）
-      const newMessage: Message = {
-        ...message,
-        clientMessageId: message.clientMessageId || '',
-        sendTime: new Date(message.sendTime).getTime(),
-        targetId: message.groupId,
-        selfSend: message.senderId === getCurrentUserId(),
-        atUserIds: message.atUserIds || [],
-        receiverUserIds: message.receiverUserIds || []
-      }
-      group.pinnedMessages = [...existing, newMessage]
+      group.pinnedMessages = [
+        ...existing,
+        {
+          id: message.id,
+          clientMessageId: '',
+          senderId: message.senderId,
+          type: message.type,
+          content: message.content,
+          status: ImMessageStatus.UNREAD,
+          sendTime: new Date(message.sendTime).getTime(),
+          targetId: message.groupId || groupId,
+          selfSend: message.senderId === getCurrentUserId(),
+          atUserIds: message.atUserIds ? [...message.atUserIds] : [],
+          receiverUserIds: message.receiverUserIds ? [...message.receiverUserIds] : []
+        }
+      ]
       this.saveGroups()
     },
 

src/views/im/utils/message.ts

@@ -693,20 +693,16 @@ export type GroupNotificationPayload = {
   // 自由进群事件
   entrantUserId?: number
   addSource?: number
-  // PIN 事件携带的完整被置顶消息对象
+  // PIN 事件携带的被置顶消息展示数据
   message?: {
     id: number
-    clientMessageId?: string
     senderId: number
     groupId: number
     type: number
     content: string
-    status: number
     sendTime: string
     atUserIds?: number[]
     receiverUserIds?: number[]
-    receiptStatus?: number
-    readCount?: number
   }
 }