Refactor SeckillActivityApiImpl to use constructor injection with Lombok

Co-authored-by: dingjiangying <dingjiangying@meituan.com>

yudao-module-mall/yudao-module-promotion/src/main/java/cn/iocoder/yudao/module/promotion/api/seckill/SeckillActivityApiImpl.java

@@ -2,11 +2,10 @@ package cn.iocoder.yudao.module.promotion.api.seckill;
 
 import cn.iocoder.yudao.module.promotion.api.seckill.dto.SeckillValidateJoinRespDTO;
 import cn.iocoder.yudao.module.promotion.service.seckill.SeckillActivityService;
+import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.validation.annotation.Validated;
 
-import javax.annotation.Resource;
-
 /**
  * 秒杀活动接口 Api 接口实现类
  *
@@ -14,10 +13,10 @@ import javax.annotation.Resource;
  */
 @Service
 @Validated
+@RequiredArgsConstructor
 public class SeckillActivityApiImpl implements SeckillActivityApi {
 
-    @Resource
+    private final SeckillActivityService activityService;
-    private SeckillActivityService activityService;
 
     @Override
     public void updateSeckillStockDecr(Long id, Long skuId, Integer count) {