feat(chat): implement sequence pre-allocation, versioned sync, and push worker

Introduce several performance and synchronization enhancements:
- Implement `SeqBufferManager` to allow sequence number pre-allocation via Redis Lua scripts, reducing atomic increment overhead.
- Add `PushWorker` to handle asynchronous message pushing using Redis Streams.
- Implement incremental conversation synchronization via `ConversationVersionLog` to allow clients to fetch only recent changes.
- Add support for Gzip compression in WebSocket communications to reduce bandwidth usage.
- Update dependency injection and configuration to support these new components.

internal/router/router.go

@@ -431,6 +431,7 @@ func (r *Router) setupRoutes() {
 			conversations.PUT("/:id/notification_muted", r.messageHandler.HandleSetConversationNotificationMuted)          // 免打扰设置
 			conversations.GET("/unread/count", r.messageHandler.GetUnreadCount)                                             // 未读数
 				conversations.GET("/sync-data", r.messageHandler.HandleGetSyncData)                                                    // 同步元数据
+				conversations.GET("/sync", r.messageHandler.HandleGetSyncByVersion)                                              // 增量同步(版本日志)
 			conversations.POST("/:id/typing", r.messageHandler.HandleTyping)                                                // 输入状态
 			conversations.DELETE("/:id/self", r.messageHandler.HandleDeleteConversationForSelf)                             // 删除会话(仅自己)