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_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"context"
 
+	"github.com/hhs/camtalk/internal/auth"
 	"github.com/hhs/camtalk/internal/config"
 	"github.com/hhs/camtalk/internal/logger"
 	"github.com/hhs/camtalk/internal/models"
@@ -144,7 +145,8 @@ func setupTestServer(t *testing.T, orch orchestrator.Orchestrator) (*httptest.Se
 		Server:  config.ServerConfig{HeartbeatInterval: 30, HeartbeatTimeout: 60},
 		Session: config.SessionConfig{MaxHistory: 20},
 	}
-	r.GET("/ws", ServeWS(sessionMgr, orch, cfg))
+	tokenMgr := auth.NewTokenManager("test-secret", 15*time.Minute, 7*24*time.Hour)
+	r.GET("/ws", ServeWS(sessionMgr, orch, cfg, tokenMgr))
 
 	srv := httptest.NewServer(r)