feat: relocate import tools into studio and harden catalog/furnidata integrity

- Move /admin/import/* tools under /admin/studio/* and add studio nav, layout and tabs
- Add shared catalog maintenance panel plus a /admin/studio/maintenance tab
- Make furnidata reconciliation overwrite conflicting entries with the
  DB-authoritative items_base classname/id (surfaced via fixedConflicts)
- Add furnidata_translate_enabled setting to skip the heavy localized
  furnidata build during import (manual build-languages still forces it)
- Update staff smoke contract test for the studio hub

src/app/admin/settings/cms-settings-config.ts

@@ -164,6 +164,14 @@ export const SETTINGS_GROUPS: SettingsGroup[] = [
 		icon: "music",
 		description: "Public URLs and overrides for SWF / Nitro asset packages.",
 		fields: [
+			{
+				key: "furnidata_translate_enabled",
+				label: "Translate furniture names",
+				description:
+					"Rebuild FurnitureData_<lang>.json with translated names after each import. Disable to skip the LibreTranslate / deep-clone work and save CPU & RAM when you don't need localized furniture names. You can still rebuild on demand via the import 'build languages' action.",
+				type: "boolean",
+				defaultValue: "1",
+			},
 			{
 				key: "habbo_gamedata_hotel",
 				label: "Habbo hotel for furni names",