Merge pull request #1377 from DaydreamCoding/fix/lifecycle-stop-duplicate-close

fix(lifecycle): TokenRefreshService Stop() 防重复 close

backend/internal/service/token_refresh_service.go

@@ -33,6 +33,7 @@ type TokenRefreshService struct {
 	proxyRepo            ProxyRepository
 
 	stopCh   chan struct{}
+	stopOnce sync.Once
 	wg       sync.WaitGroup
 }
 
@@ -130,7 +131,9 @@ func (s *TokenRefreshService) Start() {
 
 // Stop 停止刷新服务（可安全多次调用）
 func (s *TokenRefreshService) Stop() {
+	s.stopOnce.Do(func() {
 		close(s.stopCh)
+	})
 	s.wg.Wait()
 	slog.Info("token_refresh.service_stopped")
 }