fix: harden update pipeline and restore a clean production build

- update-Nitrov3.sh: build CMS into .next-staging and swap atomically so a
  failed build never takes the live site down; auto-merge new variables
  from .env.example; validate env for duplicates/broken lines; restart the
  emulator/CMS only when rebuilt or unhealthy; fix step renumbering
- next.config.ts: support NEXT_DIST_DIR for staged production builds
- fix all TS errors (unused imports, missing tryDownloadCandidates helper)
  so tsc and the production build pass clean
- add Dockerfile/.dockerignore and switch docker-compose to a CMS container
- include prevailing UI/refactor changes (SurfaceCard, ticketing, tsconfig)

src/lib/services/habbofurni.ts

@@ -96,13 +96,6 @@ export async function listFurniture(
 /**
  * Search furniture by query string.
  */
-export async function searchFurniture(
-	query: string,
-	perPage = 50,
-): Promise<HabboFurniItem[]> {
-	const result = await listFurniture({ search: query, perPage });
-	return result.items;
-}
 
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