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.

cmd/server/app.go

@@ -25,7 +25,7 @@ type App struct {
 	HotRankWorker *service.HotRankWorker
 	GRPCServer    *runner.Server
 	Server        *http.Server
-	WsHub         *ws.Hub
+	Publisher     ws.MessagePublisher
 	Logger        *zap.Logger
 }
 
@@ -37,7 +37,7 @@ func NewApp(
 	pushService service.PushService,
 	hotRankWorker *service.HotRankWorker,
 	grpcServer *runner.Server,
-	wsHub *ws.Hub,
+	publisher ws.MessagePublisher,
 	logger *zap.Logger,
 ) *App {
 	return &App{
@@ -47,7 +47,7 @@ func NewApp(
 		PushService:   pushService,
 		HotRankWorker: hotRankWorker,
 		GRPCServer:    grpcServer,
-		WsHub:         wsHub,
+		Publisher:     publisher,
 		Logger:        logger,
 	}
 }
@@ -102,9 +102,14 @@ func (a *App) Stop(ctx context.Context) error {
 	a.Logger.Info("Shutting down server")
 
 	// 1. 关闭所有 WebSocket 连接
-	if a.WsHub != nil {
+	if a.Publisher != nil {
 		a.Logger.Info("Closing WebSocket connections")
-		a.WsHub.CloseAllConnections()
+		switch p := a.Publisher.(type) {
+		case *ws.Bus:
+			p.Close()
+		case *ws.Hub:
+			p.CloseAllConnections()
+		}
 	}
 
 	// 3. 停止 HTTP 服务器