[SETTING] TanStack Query Provider 공통 세팅

[hdg0116]

ISSUE 🔗

close #21

What is this PR? 🔍

• TanStack Query 공통 QueryClient 생성 로직을 추가했습니다.
• query 기본 정책을 설정했습니다.
  • staleTime: 30_000
  • refetchOnWindowFocus: false
  • 인증/검증 API 에러는 retry 제외
  • 일반 query retry 최대 2회
• mutation 기본 retry를 비활성화했습니다.
• QueryProvider를 추가하고 App Router root layout의 {children} 영역에 연결했습니다.
• layout.tsx는 Server Component로 유지하고, provider만 최소 client boundary로 분리했습니다.

Screenshot 📷

• API 상태 관리 provider 설정 작업으로 별도 화면 변경은 없습니다.

Test Checklist ✔

• pnpm format:check
• pnpm lint
• pnpm build

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Project	Deployment	Actions	Updated (UTC)
room-in-us-front-admin	Ready	Preview	Aug 27, 2026 1:10pm

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📥 Commits

Reviewing files that changed from the base of the PR and between d624b56 and e17d4ad.

📒 Files selected for processing (4)

• src/app/layout.tsx
• src/shared/query/QueryProvider.tsx
• src/shared/query/index.ts
• src/shared/query/query-client.ts

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