feat(ws): implement WebSocket cluster mode with Redis Pub/Sub

Introduce a new WebSocket messaging architecture that supports both standalone and cluster modes. This allows for horizontal scaling of WebSocket servers by using Redis Pub/Sub to synchronize messages across multiple instances.

Key changes:
- Added `ws.MessagePublisher` interface to abstract message distribution.
- Implemented `ws.Bus` to handle cluster-mode messaging via Redis.
- Added `ws.OnlineTracker` to manage user online status across the cluster.
- Refactored multiple services (Chat, Group, Push, Call, etc.) to use the new `MessagePublisher` instead of a concrete `ws.Hub`.
- Added WebSocket configuration options (mode, instance ID, channel, TTL, heartbeat) to `config.yaml` and `config.go`.
- Updated dependency injection with Wire to support the new publisher and Redis client.
- Improved logging by replacing standard `log` with `zap` in several service components.

internal/wire/handler.go

@@ -63,9 +63,9 @@ func ProvideMessageHandler(
 	messageService *service.MessageService,
 	userService service.UserService,
 	groupService service.GroupService,
-	wsHub *ws.Hub,
+	publisher ws.MessagePublisher,
 ) *handler.MessageHandler {
-	return handler.NewMessageHandler(chatService, messageService, userService, groupService, wsHub)
+	return handler.NewMessageHandler(chatService, messageService, userService, groupService, publisher)
 }
 
 // ProvideSystemMessageHandler 提供系统消息处理器
@@ -93,14 +93,14 @@ func ProvideScheduleHandler(
 
 // ProvideWSHandler 提供WebSocket处理器
 func ProvideWSHandler(
-	wsHub *ws.Hub,
+	publisher ws.MessagePublisher,
 	chatService service.ChatService,
 	groupService service.GroupService,
 	jwtService *service.JWTService,
 	callService service.CallService,
 	userRepo repository.UserRepository,
 ) *handler.WSHandler {
-	return handler.NewWSHandler(wsHub, chatService, groupService, jwtService, callService, userRepo)
+	return handler.NewWSHandler(publisher, chatService, groupService, jwtService, callService, userRepo)
 }
 
 // ProvideAdminVerificationHandler 提供管理端身份认证处理器