Backend:
- Optimize file listing for non-superusers with dedicated CRUD methods
- Add get_visible_for_user and count_visible_for_user for efficient queries
- Move /allowed-types/ and /max-size/ routes before /{file_id} for proper matching
- Rename notification 'metadata' field to 'extra_data' for clarity
- Fix settings export to use get_value() method
Frontend:
- Update NotificationItem interface to use extra_data field
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>