fix: ClubFeeInfoResponse의 bank 필드를 bankId로 변경

[JanooGwan]

🔍 개요

• close #이슈번호

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🚀 주요 변경 내용

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💬 참고 사항

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✅ Checklist (완료 조건)

• 코드 스타일 가이드 준수
• 테스트 코드 포함됨
• Reviewers / Assignees / Labels 지정 완료
• 보안 및 민감 정보 검증 (API 키, 환경 변수, 개인정보 등)

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch hotfix/fee-bank-id

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