Add 'butler' to recommended apps

Include 'butler' in the RECOMMENDED_APP_NAMES array in RecommendedAppsService so it appears in the recommended apps list. Updates src/backend/services/apps/RecommendedAppsService.ts.

Author: jelveh

src/backend/services/apps/RecommendedAppsService.ts

@@ -27,6 +27,7 @@ import { PuterService } from '../types.js';
 const RECOMMENDED_APP_NAMES = [
     'app-center',
     'dev-center',
+    'butler',
     'editor',
     'code',
     'camera',