refactor(coupon): 移除优惠券相关模块代码

- 删除优惠券控制器相关类，包括 AppCouponController 和 CouponController
- 移除优惠券记录控制器 CouponRecordController
- 删除优惠券数据访问层接口及实现类
- 移除优惠券相关的实体类、请求响应对象
- 清理业务逻辑层中与优惠券相关的服务接口及实现
- 从 PriceBiz 中移除优惠券相关导入依赖
- 从任务类 DownloadNotificationTasker 中移除优惠券相关导入
- 删除优惠券相关的 MyBatis 映射文件

src/main/java/com/ycwl/basic/task/DownloadNotificationTasker.java

@@ -1,16 +1,11 @@
 package com.ycwl.basic.task;
 
 import cn.hutool.core.date.DateUtil;
-import com.ycwl.basic.integration.message.dto.ZtMessage;
 import com.ycwl.basic.integration.message.service.ZtMessageProducerService;
 import com.ycwl.basic.integration.scenic.dto.scenic.ScenicV2DTO;
-import com.ycwl.basic.mapper.CouponMapper;
 import com.ycwl.basic.mapper.MemberMapper;
 import com.ycwl.basic.mapper.VideoMapper;
-import com.ycwl.basic.model.pc.coupon.req.CouponQueryReq;
-import com.ycwl.basic.model.pc.coupon.resp.CouponRespVO;
 import com.ycwl.basic.model.pc.member.resp.MemberRespVO;
-import com.ycwl.basic.model.pc.mp.MpConfigEntity;
 import com.ycwl.basic.integration.common.manager.ScenicConfigManager;
 import com.ycwl.basic.model.pc.notify.req.WechatSubscribeNotifyTriggerRequest;
 import com.ycwl.basic.model.pc.notify.resp.WechatSubscribeNotifyTriggerResult;