Index Consistency Reconciler와 안전한 복구 구현

[Gimini-3]

변경 사항

• Cursor Batch 기반 Reconciliation 실행 이력과 정합성 Issue 생명주기를 추가했습니다.
• 누락 Job·Chunk·Vector, 모델 불일치, 정체 Version, currentVersion 모순, 삭제 잔여물, 고아 데이터를 탐지합니다.
• 안전한 누락 Job·Vector만 기존 Outbox/Dispatcher 경로로 복구하고 위험한 상태 변경은 보고 전용으로 유지합니다.
• 부분 Vector 복구는 기존 Embedding을 삭제하지 않고 누락 Chunk만 채웁니다.
• DRY_RUN/REPAIR 실행 모드와 주기 Scheduler를 추가했습니다.

검증

• DB_PORT=5432 JWT_SECRET=<test-secret> ./gradlew test
• 전체 백엔드 테스트 성공

Closes #164

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📥 Commits

Reviewing files that changed from the base of the PR and between c786b98 and de57337.

📒 Files selected for processing (36)

• backend/src/main/java/com/opensource/docgrid/domain/document/entity/DocumentVersion.java
• backend/src/main/java/com/opensource/docgrid/domain/document/repository/DocumentChunkRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/document/repository/DocumentVersionRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/embedding/repository/EmbeddingJobRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/embedding/repository/EmbeddingRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/embedding/service/command/DocumentEmbeddingTransactionService.java
• backend/src/main/java/com/opensource/docgrid/domain/embedding/service/command/DocumentIndexingCompletionService.java
• backend/src/main/java/com/opensource/docgrid/domain/embedding/service/command/IndexedVersionVectorRepairService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/config/SyncReconciliationProperties.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/config/SyncReconciliationSchedulingConfig.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/dto/SyncReconciliationBatchResult.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/entity/SyncConsistencyIssue.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/entity/SyncReconciliationRun.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/enums/SyncConsistencyIssueStatus.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/enums/SyncConsistencyIssueType.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/enums/SyncConsistencySeverity.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/enums/SyncReconciliationMode.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/enums/SyncReconciliationStatus.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/lifecycle/SyncReconciliationScheduler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/repository/SyncConsistencyIssueRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/repository/SyncReconciliationRunRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncConsistencyInspector.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncConsistencyObservation.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncOrphanInspector.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncReconciliationOrchestrator.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncConsistencyIssueService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncReconciliationBatchService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncReconciliationRunService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/handler/DocumentVersionSyncEventHandler.java
• backend/src/main/resources/application.yml
• backend/src/main/resources/db/migration/V37__create_sync_consistency_issues.sql
• backend/src/test/java/com/opensource/docgrid/domain/embedding/service/command/DocumentEmbeddingTransactionServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/embedding/service/command/IndexedVersionVectorRepairServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/service/SyncConsistencyInspectorTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/service/command/SyncReconciliationBatchServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/service/handler/DocumentVersionSyncEventHandlerTest.java

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