Bug: Scan files were getting status 'registered_scan' which doesn't match
any filter value (unregistered/pending/processing/completed/indexed/unindexed).
When toggling filters on/off, files would disappear because their status
didn't match any valid filter.
Fix:
- Removed 'registered_scan' status entirely
- Fetch regFiles FIRST to get real statuses
- Scan files default to 'unregistered' status
- regFiles overlay with actual status (pending/processing/completed)
- Increased regFiles page_size to 200 for larger libraries
Frontend:
- Add media type filter (全部/影片/照片)
- Add indexed status filter (未入庫/已入庫)
- Show media type column with icons
- Fix status filter to handle indexed/unindexed correctly
- Determine media type from file extension
Backend:
- Add total_chunks field to FileItem API response
- Query chunk counts efficiently in batch with IN clause
- Frontend uses total_chunks to determine is_indexed status
- Add database migrations (006-028) for face recognition, identity, file_uuid
- Add test scripts for ASR, face, search, processing
- Add portal frontend (Tauri)
- Add config, benchmark, and monitoring utilities
- Add model checkpoints and pretrained model references
