- Add DocumentBatchMetadataDTO (titles, senderId, receiverIds, documentDate, location, tags, metadataComplete)
- Add BATCH_TOO_LARGE to ErrorCode
- Extend quickUpload to accept optional @RequestPart("metadata"); dispatches to storeDocumentWithBatchMetadata when present
- Cap batch at 50 files/request; reject 400 when titles.size > files.size
- Add DocumentService.storeDocumentWithBatchMetadata applying shared fields + index-based titles to both created and updated docs
- Raise max-request-size to 500MB (10-file chunk at max per-file size)
- Add structured SLF4J logging for every quickUpload call
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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