feat: Phase 7.1 — 修改 ServeWS 签名，新增 tokenMgr 参数

- ServeWS 和 serveWS 函数新增 *auth.TokenManager 参数
- main.go 传入 tokenMgr 到 ServeWS
- handler_test.go 适配新签名

backend/internal/ws/handler.go

@@ -10,6 +10,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/gorilla/websocket"
 
+	"github.com/hhs/camtalk/internal/auth"
 	"github.com/hhs/camtalk/internal/config"
 	"github.com/hhs/camtalk/internal/errors"
 	"github.com/hhs/camtalk/internal/logger"
@@ -91,7 +92,7 @@ func (w *WSClient) SendError(err models.WsError) error {
 }
 
 // ServeWS 处理 WebSocket 升级请求。
-func ServeWS(sessionMgr session.Manager, orch orchestrator.Orchestrator, cfg *config.Config) gin.HandlerFunc {
+func ServeWS(sessionMgr session.Manager, orch orchestrator.Orchestrator, cfg *config.Config, tokenMgr *auth.TokenManager) gin.HandlerFunc {
 	upgrader := newUpgrader(cfg)
 	heartbeatInterval := time.Duration(cfg.Server.HeartbeatInterval) * time.Second
 	heartbeatTimeout := time.Duration(cfg.Server.HeartbeatTimeout) * time.Second
@@ -100,12 +101,12 @@ func ServeWS(sessionMgr session.Manager, orch orchestrator.Orchestrator, cfg *co
 	maxHistory := cfg.Session.MaxHistory
 
 	return func(c *gin.Context) {
-		serveWS(c, sessionMgr, orch, upgrader, heartbeatInterval, heartbeatTimeout, version, maxHistory)
+		serveWS(c, sessionMgr, orch, upgrader, heartbeatInterval, heartbeatTimeout, version, maxHistory, tokenMgr)
 	}
 }
 
 func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orchestrator,
-	upgrader websocket.Upgrader, heartbeatInterval, heartbeatTimeout time.Duration, version string, maxHistory int) {
+	upgrader websocket.Upgrader, heartbeatInterval, heartbeatTimeout time.Duration, version string, maxHistory int, tokenMgr *auth.TokenManager) {
 	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
 	if err != nil {
 		logger.Log.Errorw("websocket upgrade failed", "error", err)