feat: mobile-like window size and always-visible stats

- Changed window size to mobile phone format (400x800)
- Removed width condition for ActiveProxyFooter - now always visible
- Added run-umbrix.sh launch script with icon copying
- Stats cards now display on all screen sizes

lib/features/proxy/model/proxy_entity.dart

@@ -1,5 +1,5 @@
 import 'package:freezed_annotation/freezed_annotation.dart';
-import 'package:hiddify/singbox/model/singbox_proxy_type.dart';
+import 'package:umbrix/singbox/model/singbox_proxy_type.dart';
 
 part 'proxy_entity.freezed.dart';