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/qrcode_login_service.go

@@ -54,7 +54,7 @@ type QRCodeSession struct {
 // QRCodeLoginService 二维码登录服务
 type QRCodeLoginService struct {
 	redis           *redis.Client
-	wsHub           *ws.Hub
+	wsHub           ws.MessagePublisher
 	jwtService      *JWTService
 	userService     UserService
 	activityService UserActivityService
@@ -62,10 +62,10 @@ type QRCodeLoginService struct {
 }
 
 // NewQRCodeLoginService 创建二维码登录服务
-func NewQRCodeLoginService(redis *redis.Client, wsHub *ws.Hub, jwtService *JWTService, userService UserService, activityService UserActivityService, logService *LogService) *QRCodeLoginService {
+func NewQRCodeLoginService(redis *redis.Client, publisher ws.MessagePublisher, jwtService *JWTService, userService UserService, activityService UserActivityService, logService *LogService) *QRCodeLoginService {
 	return &QRCodeLoginService{
 		redis:           redis,
-		wsHub:           wsHub,
+		wsHub:           publisher,
 		jwtService:      jwtService,
 		userService:     userService,
 		activityService: activityService,
@@ -280,9 +280,16 @@ func (s *QRCodeLoginService) Cancel(ctx context.Context, sessionID, userID strin
 	return nil
 }
 
-// GetWSHub 获取WS Hub
+// GetWSHub 获取底层 WS Hub（用于 Subscribe 等本地操作）
 func (s *QRCodeLoginService) GetWSHub() *ws.Hub {
-	return s.wsHub
+	switch p := s.wsHub.(type) {
+	case *ws.Bus:
+		return p.Hub()
+	case *ws.Hub:
+		return p
+	default:
+		return nil
+	}
 }
 
 // GetUserService 获取用户服务