Marcel 0ec86220d3 feat(backend): add POST /api/admin/backfill-file-hashes endpoint
- DocumentRepository: findByFileHashIsNullAndFilePathIsNotNull()
- AnnotationRepository: findByDocumentIdAndFileHashIsNull()
- FileService: downloadFileBytes() downloads raw bytes from S3 for hashing
- AnnotationService: backfillAnnotationFileHashForDocument() sets hash on null-hash annotations
- DocumentService: backfillFileHashes() iterates documents with null hash,
  downloads bytes, computes SHA-256, saves doc, then propagates hash to annotations
- AdminController: POST /api/admin/backfill-file-hashes delegates to DocumentService

Closes #56

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-24 17:32:29 +01:00
2026-03-23 09:20:43 +01:00
2026-03-17 13:35:32 +00:00
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