보상형 광고 기반 '내 물건 우선 노출' 기능 추가

[Cassiiopeia]

작업 내용

이슈 #819 — 보상형 광고 기반 '내 물건 우선 노출'(롬업) 기능의 프론트엔드 전체 플로우 구현.

내 물건 관리 탭에서 [⚡ 우선 노출] 버튼 클릭 → AdMob 보상형 광고 시청 완료 → 백엔드 우선노출 활성화 요청.

변경 사항

• RewardedAdService — 보상형 광고 로드/표시/보상 콜백 캡슐화 (결과 boolean)
• PromotionApi / PromotionRepository — 백엔드 우선노출 API 래핑
• PromotionState / PromotionNotifier(promotionProvider) — Riverpod 4-레이어, 동기 Notifier + _inFlight dedup. "광고 보상 받아야만 BE 호출" 순서 보장
• PromoteResult enum — 화면이 결과로 토스트 분기 (notifier가 UI 비의존)
• my_register_item_screen — item tile에 우선노출 버튼/뱃지 추가, provider 구독, 토스트 분기
• 단위 테스트 4케이스 (success / adNotEarned / failed / alreadyInFlight) — 전부 통과

검증

• flutter analyze → No issues found
• flutter test → 4/4 passed

후속 (백엔드 확정 필요)

• 우선노출 API 실제 스펙(엔드포인트/바디/보상 검증) — 현재 // TODO(#819 BE) 마킹
• 앱 재시작 시 우선노출 상태 복원
• 노출 비율/만료/순번 표시

관련 이슈

• ⚙️ [기능추가][애드몹 기능] 보상형 광고 기반 '내 물건 우선 노출' 기능 추가 #819

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: f50bf9df-a0da-4cfa-9e6b-865931486d0e

📥 Commits

Reviewing files that changed from the base of the PR and between 8daf00e and d1e6a13.

📒 Files selected for processing (11)

• docs/superpowers/plans/2026-05-31-rewarded-ad-item-promotion.md
• docs/superpowers/specs/2026-05-31-rewarded-ad-item-promotion-design.md
• lib/enums/promote_result.dart
• lib/providers/promotion_provider.dart
• lib/providers/promotion_repository_provider.dart
• lib/repositories/promotion_repository.dart
• lib/screens/my_page/my_register_item_screen.dart
• lib/services/apis/promotion_api.dart
• lib/services/rewarded_ad_service.dart
• lib/states/promotion_state.dart
• test/providers/promotion_provider_test.dart

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 20260531_#819_보상형_광고_기반_내_물건_우선_노출_기능_추가

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