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/chat_service.go

@@ -67,7 +67,7 @@ type chatServiceImpl struct {
 	repo        repository.MessageRepository
 	userRepo    repository.UserRepository
 	sensitive   SensitiveService
-	wsHub       *ws.Hub
+	wsHub       ws.MessagePublisher
 	pushSvc     PushService
 	cache       cache.Cache
 
@@ -80,7 +80,7 @@ func NewChatService(
 	repo repository.MessageRepository,
 	userRepo repository.UserRepository,
 	sensitive SensitiveService,
-	wsHub *ws.Hub,
+	publisher ws.MessagePublisher,
 	cacheBackend cache.Cache,
 	uploadService *UploadService,
 	pushSvc PushService,
@@ -101,7 +101,7 @@ func NewChatService(
 		repo:              repo,
 		userRepo:          userRepo,
 		sensitive:         sensitive,
-		wsHub:             wsHub,
+		wsHub:             publisher,
 		pushSvc:           pushSvc,
 		cache:             cacheBackend,
 		conversationCache: conversationCache,