- API endpoint: /api/admin/import/official/sync-all
- Fetches all official Habbo furnidata
- Compares with database to find missing items
- Imports missing items via SSE batch with progress reporting
- 500 item limit for safety
- Proper abort signal support
- Client component: OfficialSyncClient with progress UI
- Updated StudioSyncPage to include Official Furnidata sync option
- Uses existing importSingleFurni infrastructure