feat: Lease 기반 멱등 Sync Dispatcher 구현

[Gimini-3]

변경 내용

• PostgreSQL FOR UPDATE SKIP LOCKED 기반 Sync Event Claim을 구현했습니다.
• Claim Token, Lease 갱신·만료 복구, 지수 Backoff와 최종 실패 상태를 추가했습니다.
• Handler 부작용과 Event PROCESSED 전환을 같은 트랜잭션으로 묶었습니다.
• 문서 버전·재인덱싱·삭제·권한 캐시·모델 활성화 Handler를 연결했습니다.
• 최종 실패 Event의 관리자 재시도 기반을 추가했습니다.

영향

at-least-once 전달과 다중 Dispatcher 환경에서도 같은 Event의 중복 Job 생성을 차단하고, 중단된 실행은 Lease 만료 후 회수됩니다.

검증

• Event 상태 전이·Claim·Dispatch·문서 Handler 단위 테스트
• 기존 문서·컬렉션 권한 서비스 회귀 테스트
• PostgreSQL에서 20개 Dispatcher 동시 Claim 테스트
• 전체 backend 테스트 통과

Closes #163

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📥 Commits

Reviewing files that changed from the base of the PR and between 99f672e and b82774b.

📒 Files selected for processing (36)

• 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/permission/service/command/CollectionPermissionCommandService.java
• backend/src/main/java/com/opensource/docgrid/domain/permission/service/command/DocumentPermissionCommandService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/config/SyncDispatcherProperties.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/config/SyncSchedulingConfig.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/dto/ClaimedSyncEvent.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/entity/SyncOutboxEvent.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/enums/SyncPermissionOperation.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/lifecycle/SyncEventLeaseRecoveryScheduler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/lifecycle/SyncEventPollingScheduler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/repository/SyncOutboxEventRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncEventHandler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncEventHandlerRegistry.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncEventPayloadReader.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/SyncEventRetrySchedule.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventClaimService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventDispatchService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventFailureService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventLeaseRecoveryService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventLeaseService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventManualRetryService.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/command/SyncEventWriter.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/handler/DocumentDeletedSyncEventHandler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/handler/DocumentVersionSyncEventHandler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/handler/EmbeddingModelActivatedSyncEventHandler.java
• backend/src/main/java/com/opensource/docgrid/domain/sync/service/handler/PermissionCacheRefreshSyncEventHandler.java
• backend/src/main/java/com/opensource/docgrid/global/exception/ErrorCode.java
• backend/src/main/resources/application.yml
• backend/src/test/java/com/opensource/docgrid/domain/permission/service/command/CollectionPermissionCommandServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/permission/service/command/DocumentPermissionCommandServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/entity/SyncOutboxEventTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/integration/SyncEventClaimIntegrationTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/service/command/SyncEventClaimServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/service/command/SyncEventDispatchServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/sync/service/handler/DocumentVersionSyncEventHandlerTest.java

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