fix: RechargePromotionMapper 改为继承 MyBaseMapper 修复编译错误

MyBaseServiceImpl 要求 M extends MyBaseMapper<T>，而非 MPJBaseMapper<T>

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

car-wash-mapper/src/main/java/com/kym/mapper/RechargePromotionMapper.java

@@ -1,11 +1,11 @@
 package com.kym.mapper;
 
-import com.github.yulichang.base.MPJBaseMapper;
 import com.kym.entity.RechargePromotion;
+import com.kym.mapper.mybatisplus.MyBaseMapper;
 
 /**
  * @author skyline
  * @since 2026-06-03
  */
-public interface RechargePromotionMapper extends MPJBaseMapper<RechargePromotion> {
+public interface RechargePromotionMapper extends MyBaseMapper<RechargePromotion> {
 }