fix(can-coupon): 쿠폰 사용 본인인증 예외를 성인 노출 정책에 맞춘다

src/main/kotlin/kr/co/vividnext/sodalive/can/coupon/CanCouponService.kt

@@ -8,6 +8,7 @@ import kr.co.vividnext.sodalive.common.SodaException
 import kr.co.vividnext.sodalive.i18n.LangContext
 import kr.co.vividnext.sodalive.i18n.SodaMessageSource
 import kr.co.vividnext.sodalive.member.MemberRepository
+import kr.co.vividnext.sodalive.member.contentpreference.MemberContentPreferenceService
 import org.apache.poi.xssf.usermodel.XSSFWorkbook
 import org.springframework.context.ApplicationEventPublisher
 import org.springframework.data.repository.findByIdOrNull
@@ -29,6 +30,7 @@ class CanCouponService(
     private val couponNumberRepository: CanCouponNumberRepository,
 
     private val memberRepository: MemberRepository,
+    private val memberContentPreferenceService: MemberContentPreferenceService,
 
     private val objectMapper: ObjectMapper,
     private val applicationEventPublisher: ApplicationEventPublisher,
@@ -133,7 +135,8 @@ class CanCouponService(
         val member = memberRepository.findByIdOrNull(id = memberId)
             ?: throw SodaException(messageKey = "common.error.bad_credentials")
 
-        if (member.auth == null) throw SodaException(messageKey = "can.coupon.auth_required")
+        val viewerContentPreference = memberContentPreferenceService.getStoredPreference(member)
+        if (!viewerContentPreference.isAdult) throw SodaException(messageKey = "can.coupon.auth_required")
 
         issueService.validateAvailableUseCoupon(couponNumber, memberId)