[Fix] get_document_detail이 삭제된 문서를 걸러내지 않던 문제 수정

[kangcheolung]

Summary

• DocGridMcpTools.getDocumentDetail()에 DocumentStatus.DELETED 체크 추가
• 형제 도구 get_indexing_status(DocumentQueryService.getDocumentStatus())와의 비대칭 해소 — 소프트 삭제된 문서를 조회하면 이제 동일하게 DOCUMENT_NOT_FOUND를 반환

closes #291

Test plan

• getDocumentDetail_throws_when_documentDeleted 신규 단위 테스트 추가
• ./backend/gradlew -p backend test 전체 통과

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📥 Commits

Reviewing files that changed from the base of the PR and between 9cf27ec and 862a490.

📒 Files selected for processing (2)

• backend/src/main/java/com/opensource/docgrid/domain/mcp/tool/DocGridMcpTools.java
• backend/src/test/java/com/opensource/docgrid/domain/mcp/tool/DocGridMcpToolsTest.java

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