fix: 通知 SSE 长连接被 Nginx 60s 超时掐断

apps/admin/src/components/NotificationBell.tsx

@@ -58,6 +58,7 @@ const NotificationBell: React.FC = () => {
     const token = useUserStore.getState().token;
     if (!token) return;
     const es = new EventSource(`/api/notifications/stream?token=${encodeURIComponent(token)}`);
+    es.onopen = () => setSseDown(false);
     es.onmessage = (event) => {
       try {
         JSON.parse(event.data);
@@ -68,7 +69,7 @@ const NotificationBell: React.FC = () => {
       }
     };
     es.onerror = () => {
-      es.close();
+      // 不主动关闭：EventSource 会自动重连，主动关闭会导致一次超时后实时通知永久断流
       setSseDown(true);
     };
     return () => {