fix: 시트 동아리 등록 상세 소개 빈 값 저장

[JanooGwan]

🔍 개요

• 동아리 엑셀 양식에는 상세 소개 컬럼이 없으므로, Google Sheet import preview 및 confirm에서 상세 소개를 빈 값으로 처리하도록 변경했습니다.

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🚀 주요 변경 내용

• 시트 import preview 응답의 introduce를 한 줄 소개 복사값이 아닌 빈 문자열로 반환합니다.
• 시트 import confirm 시 WebClub.introduce에 빈 문자열을 저장할 수 있도록 DTO 검증과 저장 로직을 조정했습니다.
• 관련 서비스/컨트롤러 단위 테스트를 갱신했습니다.

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💬 참고 사항

• WebClub.introduce 컬럼은 nullable=false이므로 null이 아닌 빈 문자열로 저장합니다.
• description은 기존처럼 한 줄 소개로 유지됩니다.

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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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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: c789d46a-bd41-4fe2-b502-d358e084b6ca

📥 Commits

Reviewing files that changed from the base of the PR and between 0167150 and a00a403.

📒 Files selected for processing (4)

• src/main/java/gg/agit/konect/admin/website/dto/AdminWebsiteClubSheetImportConfirmRequest.java
• src/main/java/gg/agit/konect/admin/website/service/AdminWebsiteClubSheetImportService.java
• src/test/java/gg/agit/konect/unit/admin/website/controller/AdminWebsiteClubSheetImportControllerTest.java
• src/test/java/gg/agit/konect/unit/admin/website/service/AdminWebsiteClubSheetImportServiceTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sheet-import-empty-introduce

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[github-actions]

🧪 JaCoCo Coverage Report (Changed Files)

Summary

• Overall Coverage: 79.0% ✅
• Covered Lines: 124 / 157
• Changed Files: 2

Coverage by File

Class	Coverage	Lines	Status
AdminWebsiteClubSheetImportService gg.agit.konect.admin.website.service	79.0%	124/157	✅

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