feat(apps): 重构 UI 架构为 presentation 层并新增 l10n 国际化支持

apps/lib/core/l10n/l10n.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/widgets.dart';
+
+import '../../l10n/app_localizations.dart';
+
+class L10n {
+  static Locale _locale = const Locale('zh');
+
+  static void setLocale(Locale locale) {
+    _locale = locale;
+  }
+
+  static AppLocalizations get current => lookupAppLocalizations(_locale);
+}
+
+extension L10nContextX on BuildContext {
+  AppLocalizations get l10n => AppLocalizations.of(this);
+}