Backfill missing nitros into the Gamedata bundle on import

After each single import, batch import and batch-regen, copy every
.nitro file that is missing from /var/www/Gamedata/bundled/furniture so
the emulator can render all imported furniture even when the mirror write
was skipped. Reports the copied files in the API/SSE response.

src/app/api/admin/import/furni/batch/route.ts

@@ -9,6 +9,7 @@ import {
 	ensureFurniOwnership,
 	importSingleFurni,
 	reconcileImportedOfferIds,
+	syncNitrosToGamedataBundle,
 } from "@/lib/services/furni-import";
 import { rcon } from "@/lib/services/rcon";
 import type { ImportSingleResult } from "@/types/furni";
@@ -216,9 +217,11 @@ export const POST = withAdmin(
 				// Reconcile offer_id and fix asset ownership across the whole tree
 				let offerIdsFixed = 0;
 				let ownershipFixed: string[] = [];
+				let nitrosSynced: string[] = [];
 				try {
 					offerIdsFixed = (await reconcileImportedOfferIds()).fixed;
 					ownershipFixed = (await ensureFurniOwnership()).fixed;
+					nitrosSynced = (await syncNitrosToGamedataBundle()).copied;
 				} catch (err) {
 					console.warn(
 						"[import-furni] Post-import reconcile/ownership failed:",
@@ -233,6 +236,7 @@ export const POST = withAdmin(
 					warnings: withWarnings,
 					offerIdsFixed,
 					ownershipFixed,
+					nitrosSynced,
 					duration: Date.now() - startTime,
 				});