feat(message): implement version-based incremental sync and WS compression

Implement a more efficient conversation synchronization mechanism using
version numbers instead of sequence numbers to reduce bandwidth usage.
This includes adding support for Gzip decompression on WebSocket
messages to optimize data transfer.

- Add `pako` for WebSocket message decompression
- Implement `getSyncByVersion` in `MessageService`
- Implement `syncByVersion` in `MessageSyncService` to handle incremental
  updates and conversation state changes
- Update `WebSocketService` to support binary frames and Gzip inflation
- Add `syncVersion` to `MessageStore` for tracking synchronization state

src/stores/message/services/MessageSyncService.ts

@@ -466,6 +466,65 @@ export class MessageSyncService implements IMessageSyncService {
     }
   }
 
+  /**
+   * 基于版本号的增量同步（替代 syncBySeq，减少带宽）
+   * 需要本地存储 syncVersion，首次同步时 version=0 会触发 full_sync
+   */
+  async syncByVersion(): Promise<boolean> {
+    try {
+      const store = useMessageStore.getState();
+      const version = store.syncVersion ?? 0;
+
+      const result = await messageService.getSyncByVersion(version, 100);
+      if (!result) return false;
+
+      // full_sync 表示需要全量刷新
+      if (result.full_sync) {
+        return false;
+      }
+
+      if (result.changes.length === 0) {
+        // 保存当前版本号，下次增量同步时使用
+        useMessageStore.getState().setSyncVersion(result.current_version);
+        return true;
+      }
+
+      // 按变更类型处理
+      const staleIds: string[] = [];
+      for (const change of result.changes) {
+        const normId = normalizeConversationId(change.conversation_id);
+        if (change.change_type === 'hide') {
+          // 用户隐藏了会话，从本地移除
+          store.removeConversation(normId);
+        } else {
+          // new_msg, read, pin, unpin, mute, unmute, group_update
+          staleIds.push(normId);
+        }
+      }
+
+      // 刷新有变更的会话
+      if (staleIds.length > 0) {
+        const detailPromises = staleIds.map(id =>
+          this.fetchConversationDetail(id).catch(() => {})
+        );
+        await Promise.all(detailPromises);
+      }
+
+      // 保存版本号
+      useMessageStore.getState().setSyncVersion(result.current_version);
+
+      // has_more 时继续拉取
+      if (result.has_more) {
+        return this.syncByVersion();
+      }
+
+      return true;
+    } catch (error) {
+      console.error('[MessageSyncService] syncByVersion 失败:', error);
+      return false;
+    }
+  }
+
   /**
    * 检查是否可加载更多会话
    */

src/stores/message/store.ts

@@ -53,6 +53,9 @@ export interface MessageState {
 
   // 会话免打扰状态 - 按会话ID存储
   notificationMutedMap: Map<string, boolean>;
+
+  // 版本日志同步游标
+  syncVersion: number | null;
 }
 
 // ==================== Actions 接口 ====================
@@ -90,6 +93,7 @@ export interface MessageActions {
   setTypingUsers: (groupId: string, users: string[]) => void;
   setMutedStatus: (groupId: string, isMuted: boolean) => void;
   setNotificationMuted: (conversationId: string, notificationMuted: boolean) => void;
+  setSyncVersion: (version: number) => void;
   setInitialized: (initialized: boolean) => void;
 
   // 原子性更新（避免中间渲染状态）
@@ -121,6 +125,7 @@ const initialState: MessageState = {
   typingUsersMap: new Map(),
   mutedStatusMap: new Map(),
   notificationMutedMap: new Map(),
+  syncVersion: null,
 };
 
 // ==================== 工具函数 ====================
@@ -189,6 +194,7 @@ export const useMessageStore = create<MessageStore>((set, get) => ({
       typingUsersMap: state.typingUsersMap,
       mutedStatusMap: state.mutedStatusMap,
       notificationMutedMap: state.notificationMutedMap,
+      syncVersion: state.syncVersion,
     };
   },
 
@@ -387,6 +393,10 @@ export const useMessageStore = create<MessageStore>((set, get) => ({
     });
   },
 
+  setSyncVersion: (version: number) => {
+    set({ syncVersion: version });
+  },
+
   setInitialized: (initialized: boolean) => {
     set({ isInitialized: initialized });
   },