feat: add official furnidata sync button for importing all missing items

- 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

src/app/admin/studio/sync/page.tsx

@@ -1,4 +1,5 @@
 import { redirect } from "next/navigation";
+import { OfficialSyncClient } from "@/app/admin/import/official/official-sync-client";
 import { SyncAllClient } from "@/app/admin/import/sync/sync-all-client";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
@@ -28,6 +29,17 @@ export default async function StudioSyncPage(_props: {
 					</p>
 					<SyncAllClient />
 				</div>
+
+				<div>
+					<h2 className="text-lg font-semibold text-muted-foreground mb-2">
+						Official Furnidata
+					</h2>
+					<p className="text-sm text-muted-foreground">
+						Scan the official Habbo furnidata and automatically import any
+						furniture that your hotel doesn't have yet.
+					</p>
+					<OfficialSyncClient />
+				</div>
 			</div>
 		</div>
 	);