系统设置增加「系统更新」Tab：中控本机更新与客户端远程更新，实例页入口移除。

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

app.py

@@ -526,6 +526,39 @@ def api_open_url(iid: int):
     return jsonify({"ok": True, "url": url, "base_url": inst["base_url"]})
 
 
+@app.route("/api/settings/update/hub/version", methods=["GET"])
+@login_required
+def api_hub_self_version():
+    from lib.update_lib import read_git_version
+
+    return jsonify(read_git_version())
+
+
+@app.route("/api/settings/update/hub", methods=["POST"])
+@login_required
+def api_hub_self_update():
+    """系统设置:中控本机快速更新."""
+    from lib.update_lib import schedule_pull_and_restart
+
+    result = schedule_pull_and_restart(delay_seconds=1.5)
+    return jsonify(result), (200 if result.get("ok") else 400)
+
+
+@app.route("/api/settings/update/clients", methods=["GET"])
+@login_required
+def api_update_clients():
+    items = [
+        {
+            "id": i["id"],
+            "name": i.get("name") or f"#{i['id']}",
+            "base_url": i.get("base_url") or "",
+            "enabled": bool(i.get("enabled")),
+        }
+        for i in list_instances(enabled_only=False)
+    ]
+    return jsonify({"ok": True, "items": items})
+
+
 @app.route("/api/instances/<int:iid>/version", methods=["GET"])
 @login_required
 def api_instance_version(iid: int):
@@ -540,7 +573,7 @@ def api_instance_version(iid: int):
 @app.route("/api/instances/<int:iid>/update", methods=["POST"])
 @login_required
 def api_instance_update(iid: int):
-    """实例页远程快速更新:转发客户端 Bridge /api/hub/update."""
+    """系统设置远程更新客户端:转发 Bridge /api/hub/update."""
     inst = get_instance(iid)
     if not inst:
         return jsonify({"ok": False, "msg": "实例不存在"}), 404