feature/NG-27: Qualified bonus regulations 奖金合格制度：活动期间购买指定商品，BV≥27即可维持活跃度.

common/models/User.php

@@ -475,7 +475,7 @@ class User extends \common\components\ActiveRecord
     /**
      * @throws Exception
      */
-    public function isPerfActive($userId, $periodNum, $calcYearMonth): bool
+    public static function isPerfActive($userId, $periodNum, $calcYearMonth): bool
     {
         $sysConfig = Cache::getSystemConfig();