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/handler/message_handler.go

@@ -90,17 +90,17 @@ type MessageHandler struct {
 	messageService *service.MessageService
 	userService    service.UserService
 	groupService   service.GroupService
-	wsHub          *ws.Hub
+	wsPublisher    ws.MessagePublisher
 }
 
 // NewMessageHandler 创建消息处理器
-func NewMessageHandler(chatService service.ChatService, messageService *service.MessageService, userService service.UserService, groupService service.GroupService, wsHub *ws.Hub) *MessageHandler {
+func NewMessageHandler(chatService service.ChatService, messageService *service.MessageService, userService service.UserService, groupService service.GroupService, wsPublisher ws.MessagePublisher) *MessageHandler {
 	return &MessageHandler{
 		chatService:    chatService,
 		messageService: messageService,
 		userService:    userService,
 		groupService:   groupService,
-		wsHub:          wsHub,
+		wsPublisher:    wsPublisher,
 	}
 }