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/service/group_service.go

@@ -112,13 +112,13 @@ type groupService struct {
 	messageRepo       repository.MessageRepository
 	requestRepo       repository.GroupJoinRequestRepository
 	notifyRepo        repository.SystemNotificationRepository
-	wsHub             *ws.Hub
+	wsHub             ws.MessagePublisher
 	cache             cache.Cache
 	conversationCache *cache.ConversationCache
 }
 
 // NewGroupService 创建群组服务
-func NewGroupService(groupRepo repository.GroupRepository, userRepo repository.UserRepository, messageRepo repository.MessageRepository, requestRepo repository.GroupJoinRequestRepository, notifyRepo repository.SystemNotificationRepository, wsHub *ws.Hub, cacheBackend cache.Cache) GroupService {
+func NewGroupService(groupRepo repository.GroupRepository, userRepo repository.UserRepository, messageRepo repository.MessageRepository, requestRepo repository.GroupJoinRequestRepository, notifyRepo repository.SystemNotificationRepository, publisher ws.MessagePublisher, cacheBackend cache.Cache) GroupService {
 	convRepoAdapter := cache.NewConversationRepositoryAdapter(messageRepo)
 	msgRepoAdapter := cache.NewMessageRepositoryAdapter(messageRepo)
 	conversationCache := cache.NewConversationCache(
@@ -134,7 +134,7 @@ func NewGroupService(groupRepo repository.GroupRepository, userRepo repository.U
 		messageRepo:       messageRepo,
 		requestRepo:       requestRepo,
 		notifyRepo:        notifyRepo,
-		wsHub:             wsHub,
+		wsHub:             publisher,
 		cache:             cacheBackend,
 		conversationCache: conversationCache,
 	}