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/service/message_service.go

@@ -49,6 +49,7 @@ func NewMessageService(messageRepo repository.MessageRepository, cacheBackend ca
 		convRepoAdapter,
 		msgRepoAdapter,
 		cache.DefaultConversationCacheSettings(),
+		nil,
 	)
 
 	return &MessageService{