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

@@ -492,7 +492,7 @@ class User extends \common\components\ActiveRecord
         $calcYear = $periodObj->getYear($periodNum);
         $calcMonth = $periodObj->getMonth($periodNum);
 
-        $calcMonth = $calcYear . ($calcMonth == 1 ? '0' . $calcMonth : $calcMonth);
+        $calcMonth = $calcYear . (strlen($calcMonth) == 1 ? '0' . $calcMonth : $calcMonth);
 
         // 条件2: 任意水机+150粒的EKSP(HES150N)
         $orderEKSP = Order::find()