Fix hub AI save: background PM2 restart after JSON response.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/env/shared_env_lib.py

@@ -195,22 +195,27 @@ def apply_ai_env_to_all(updates: dict[str, str]) -> dict[str, Any]:
     }
 
 
-def restart_hub_and_instances_pm2() -> dict[str, Any]:
+def restart_instances_then_hub_pm2() -> dict[str, Any]:
+    """先重启三实例，最后重启中控（避免当前请求被中断）。"""
     if not sys.platform.startswith("linux"):
         return {"ok": False, "msg": "仅 Linux 服务器支持 PM2 重启", "results": []}
     from lib.instance.instance_pm2_lib import restart_instance_pm2
 
-    apps = ["manual-trading-hub"]
     results: list[dict[str, Any]] = []
-    hub_result = _restart_pm2_app("manual-trading-hub")
-    results.append({"app": "manual-trading-hub", **hub_result})
     for ex in ("okx", "binance", "gate"):
         r = restart_instance_pm2(ex)
         results.append({"exchange": ex, **r})
+    hub_result = _restart_pm2_app("manual-trading-hub")
+    results.append({"app": "manual-trading-hub", **hub_result})
     ok = all(r.get("ok") for r in results)
     return {"ok": ok, "results": results}
 
 
+def restart_hub_and_instances_pm2() -> dict[str, Any]:
+    """兼容旧调用：与 restart_instances_then_hub_pm2 相同顺序。"""
+    return restart_instances_then_hub_pm2()
+
+
 def _restart_pm2_app(app_name: str) -> dict[str, Any]:
     try:
         proc = subprocess.run(