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/group_service.go

@@ -126,6 +126,7 @@ func NewGroupService(groupRepo repository.GroupRepository, userRepo repository.U
 		convRepoAdapter,
 		msgRepoAdapter,
 		cache.DefaultConversationCacheSettings(),
+		nil,
 	)
 
 	return &groupService{