优化下拉列表组件，修复若干BUG

app/admin/controller/auth/Admin.php

@@ -263,11 +263,28 @@ class Admin extends Backend
     }
 
     /**
-     * 远程下拉（Admin 无自定义，走父类默认列表）
+     * 远程下拉（返回管理员列表供 remoteSelect 使用）
      */
     public function select(Request $request): Response
     {
-        return parent::select($request);
+        $response = $this->initializeBackend($request);
+        if ($response !== null) {
+            return $response;
+        }
+
+        list($where, $alias, $limit, $order) = $this->queryBuilder();
+        $res = $this->model
+            ->withoutField('login_failure,password,salt')
+            ->withJoin($this->withJoinTable ?? [], $this->withJoinType ?? 'LEFT')
+            ->alias($alias)
+            ->where($where)
+            ->order($order)
+            ->paginate($limit);
+
+        return $this->success('', [
+            'list'  => $res->items(),
+            'total' => $res->total(),
+        ]);
     }
 
     private function checkGroupAuth(array $groups): ?Response