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nendo 36eec298d1 Add device-based save synchronization
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
2026-01-18 16:50:44 +09:00
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