Commit d080da2
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feature: 쿠폰 사용 및 할인 계산 로직 추가
- 할인 정보를 담기 위한 `CouponDiscountResult` 레코드 도입
- 주문 시 쿠폰 사용을 위해 `OrderCommand`에 `couponId` 필드 추가
- 쿠폰 검증·사용·할인 금액 계산을 처리하는 `useCouponAndCalculateDiscount` 메서드를 `CouponService`에 추가1 parent 007c152 commit d080da2
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- apps/commerce-api/src/main/java/com/loopers/domain
- coupon
- order
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