fix(admin/node)：默认 op 排序导致无法加载

src/Controllers/Admin/NodeController.php

@@ -314,8 +314,12 @@ class NodeController extends AdminController
         $limit_length = $request->getParam('length');
         $search       = $request->getParam('search')['value'];
 
-        if ($order_field == 'outaddress') {
-            $order_field = 'server';
+        $fields = [
+            'op'         => 'id',
+            'outaddress' => 'server',
+        ];
+        if (isset($fields[$order_field])) {
+            $order_field = $fields[$order_field];
         }
 
         $nodes          = [];