feat: auto-translate furnidata per import (nl/en/de/fr/es/tr/it)

Generate localized FurnitureData_<lang>.json files from the master
FurnitureData.json + official Habbo hotel translations. Fetches per-hotel
furnidata with in-memory cache (6h TTL), maps by classname (* variant
aware), and overrides name/description where a translation exists.

Full rebuild after every batch/batch-regen/clone import and as admin
GET ?action=build-languages; single imports patch incrementally via
patchLocalizedFurniDataEntries. Failures are best-effort and never fail
the import itself. Files are written to every configured gamedata write
path (primary + mirrors) so /gamedata/config/FurnitureData_<lang>.json
is available for per-language Nitro clients.

New service: src/lib/services/furni-data-i18n.ts with
buildLocalizedFurniDataFiles, patchLocalizedFurniDataEntries,
FURNIDATA_LANGUAGES (nl/en/de/fr/es/tr/it) and applyTranslationsForTest.

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

@@ -9,6 +9,7 @@ import {
 	reconcileFurniDataWithItemsBase,
 	verifyAndFixSpriteIds,
 } from "@/lib/services/furni-data";
+import { buildLocalizedFurniDataFiles } from "@/lib/services/furni-data-i18n";
 import {
 	ensureDirectories,
 	ensureFurniOwnership,
@@ -232,6 +233,9 @@ export const POST = withAdmin(
 				let offerRebuildFixed = 0;
 				let spriteFixed = 0;
 				let interactionFixed = 0;
+				let languages: Awaited<
+					ReturnType<typeof buildLocalizedFurniDataFiles>
+				> = [];
 				try {
 					offerIdsFixed = (await reconcileImportedOfferIds()).fixed;
 					ownershipFixed = (await ensureFurniOwnership()).fixed;
@@ -246,6 +250,14 @@ export const POST = withAdmin(
 					offerRebuildFixed = (await rebuildCatalogOfferIds()).fixed;
 					spriteFixed = (await verifyAndFixSpriteIds()).fixed;
 					interactionFixed = (await verifyAndFixInteractionModesCount()).fixed;
+					try {
+						languages = await buildLocalizedFurniDataFiles();
+					} catch (err) {
+						console.warn(
+							"[import-furni] Localized furnidata build failed:",
+							(err as Error).message,
+						);
+					}
 				} catch (err) {
 					console.warn(
 						"[import-furni] Post-import reconcile/ownership failed:",
@@ -269,6 +281,7 @@ export const POST = withAdmin(
 					offerRebuildFixed,
 					spriteFixed,
 					interactionFixed,
+					languages,
 					duration: Date.now() - startTime,
 				});