- Added RevisionMiddleware to settings for automatic user tracking
- Created VersionSerializer and ActivityItemSerializer for version history
- Implemented GET /documents/{id}/versions/ endpoint
- Implemented GET /documents/{id}/activity/ endpoint (versions + audit + acknowledgements)
- Implemented POST /documents/{id}/revert/ endpoint for version rollback
- Activity timeline combines data from reversion, audit log, and acknowledgements
- All endpoints properly serialize user data with avatar support
This unblocks the Activity and Versions tabs in DocumentDetailModal.
igor_nadein
7739e7520e