diff --git a/lib/env/shared_env_lib.py b/lib/env/shared_env_lib.py
index ceef445..af2634a 100644
--- a/lib/env/shared_env_lib.py
+++ b/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(
diff --git a/manual_trading_hub/hub.py b/manual_trading_hub/hub.py
index 9dc6ee6..a7c2da7 100644
--- a/manual_trading_hub/hub.py
+++ b/manual_trading_hub/hub.py
@@ -110,7 +110,7 @@ from env_load import load_hub_dotenv
 load_hub_dotenv()
 
 import httpx
-from fastapi import Body, FastAPI, File, Form, HTTPException, Request, UploadFile
+from fastapi import BackgroundTasks, Body, FastAPI, File, Form, HTTPException, Request, UploadFile
 from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 from pydantic import BaseModel, Field
@@ -1706,27 +1706,21 @@ def api_get_ai_env(request: Request):
 
 
 @app.post("/api/settings/ai-env")
-def api_save_ai_env(request: Request, body: HubAiEnvBody):
+def api_save_ai_env(request: Request, body: HubAiEnvBody, background_tasks: BackgroundTasks):
     _require_hub_logged_in(request)
     from hub_env_lib import get_hub_ai_env_payload, restart_all_pm2, save_hub_ai_env
 
     result = save_hub_ai_env(body.values or {})
     if not result.get("ok"):
         raise HTTPException(status_code=400, detail="; ".join(result.get("errors") or ["保存失败"]))
-    restart_result = None
-    if body.restart and result.get("restart_required"):
-        restart_result = restart_all_pm2()
-        if not restart_result.get("ok"):
-            raise HTTPException(
-                status_code=500,
-                detail="保存成功但 PM2 重启失败，请手动 restart",
-            )
     payload = get_hub_ai_env_payload()
+    restart_required = bool(body.restart and result.get("restart_required"))
+    if restart_required:
+        background_tasks.add_task(restart_all_pm2)
     return {
         "ok": True,
         "changed": result.get("changed") or {},
-        "restart_required": bool(result.get("restart_required")),
-        "restart": restart_result,
+        "restart_required": restart_required,
         "sync_status": payload.get("sync_status"),
     }
 
diff --git a/manual_trading_hub/hub_env_lib.py b/manual_trading_hub/hub_env_lib.py
index ffc9ece..94ee7f8 100644
--- a/manual_trading_hub/hub_env_lib.py
+++ b/manual_trading_hub/hub_env_lib.py
@@ -41,7 +41,7 @@ def save_hub_ai_env(updates: dict[str, str]) -> dict[str, Any]:
 
 
 def restart_all_pm2() -> dict[str, Any]:
-    return restart_hub_and_instances_pm2()
+    return restart_instances_then_hub_pm2()
 
 
 def restart_hub_pm2() -> dict[str, Any]:
diff --git a/manual_trading_hub/static/app.js b/manual_trading_hub/static/app.js
index b30b4d5..65224ad 100644
--- a/manual_trading_hub/static/app.js
+++ b/manual_trading_hub/static/app.js
@@ -4409,6 +4409,16 @@
     return values;
   }
 
+  async function parseApiJson(r) {
+    const ct = (r.headers.get("content-type") || "").toLowerCase();
+    if (!ct.includes("application/json")) {
+      const text = await r.text();
+      const snippet = (text || "").replace(/\s+/g, " ").trim().slice(0, 120);
+      throw new Error(snippet ? `服务返回非 JSON：${snippet}` : `HTTP ${r.status}`);
+    }
+    return r.json();
+  }
+
   async function saveHubAiEnv() {
     const status = document.getElementById("hub-ai-env-save-status");
     const setStatus = (msg, err) => {
@@ -4423,15 +4433,17 @@
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ values: collectHubAiEnvValues(), restart: true }),
       });
-      const j = await r.json();
+      const j = await parseApiJson(r);
       if (!r.ok) throw new Error(j.detail || j.msg || "保存失败");
       if (!j.changed || !Object.keys(j.changed).length) {
         setStatus("未修改（与当前配置相同）");
         showToast("未修改");
         return;
       }
-      setStatus("已同步三所，服务重启中…");
-      await waitHubHealth();
+      if (j.restart_required) {
+        setStatus("已同步三所，服务重启中…");
+        await waitHubHealth();
+      }
       setStatus("AI 配置已保存并同步至三所实例");
       showToast("AI 配置已保存并同步");
       await loadHubAiEnvSettings();
diff --git a/manual_trading_hub/static/index.html b/manual_trading_hub/static/index.html
index 62a812c..8b42f08 100644
--- a/manual_trading_hub/static/index.html
+++ b/manual_trading_hub/static/index.html
@@ -1192,6 +1192,6 @@
   <script src="/assets/time_close_ui.js?v=3"></script>
   <script src="/assets/options_expiry_countdown.js?v=1"></script>
   <script src="/assets/backup.js?v=1"></script>
-  <script src="/assets/app.js?v=20260708-hub-tp-profit"></script>
+  <script src="/assets/app.js?v=20260708-hub-ai-save"></script>
 </body>
 </html>