Add model_validator to SaveSchema that safely handles SQLAlchemy lazy
relationships by checking inspect(obj).unloaded before attribute access.
This allows direct use of model_validate(orm_obj) instead of manually
building a dict and excluding device_syncs.
- Add device registration and save synchronization
- Implement slot-based save organization with datetime tagging
- Add conflict detection for multi-device sync scenarios
- Add content hash computation for save deduplication
- Support ZIP inner-file hashing for consistent deduplication
- Add confirm_download endpoint for sync state management
- Add overwrite parameter to bypass conflict checks
Implement device registration and save sync tracking to enable
multi-device save management with conflict detection.
- Device CRUD endpoints (POST/GET/PUT/DELETE /api/devices)
- Save sync state tracking per device
- Conflict detection on upload (409 when device has stale sync)
- Download sync tracking (optimistic and confirmed modes)
- Track/untrack saves per device
- DEVICES_READ/WRITE scopes for authorization
