[refactor] React Query 캐싱 전략 개선

[seongwon030]

Summary

• useBanner staleTime/gcTime 24h → 1h (긴급 배너 교체 시 최대 24시간 구버전 노출 리스크 해소)
• usePromotion staleTime 5min → 1min (refetchInterval: 3min보다 짧게 조정하여 폴링 후 데이터가 즉시 fresh로 인식되도록 수정)
• docs/claude/api.md 및 docs/features/hooks/cacheStrategy.md에 캐싱 전략 기준 문서화

Test plan

• 메인 페이지 배너 정상 로딩 확인
• 홍보 게시판 페이지에서 3분 주기 자동 갱신 확인
• 다른 페이지에서 홍보 게시판 5분 주기 백그라운드 갱신 확인

Closes MOA-863

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Project	Deployment	Actions	Updated (UTC)
moadong	Ready	Preview, Comment	May 17, 2026 7:36am

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📒 Files selected for processing (4)

• frontend/docs/claude/api.md
• frontend/docs/features/hooks/cacheStrategy.md
• frontend/src/hooks/Queries/useBanner.ts
• frontend/src/hooks/Queries/usePromotion.ts

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