chore(client): 归档原型阶段新增文件（配置、主题、模型与测试）

为什么：上一批归档只覆盖了「已跟踪文件的修改」，原型阶段新增的文件（app_config、theme、
home_feed/play_ticket 模型、catalog_api、测试目录等）还是未入库状态 —— 而已入库的代码会 import 它们，
留在工作区会导致 HEAD 处的代码编译不过。一并归档，让 HEAD 自洽。

纯归档，无行为改动。

test/config/locale_controller_test.dart

@@ -0,0 +1,92 @@
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:nontonki/core/config/locale_controller.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
+import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
+
+void main() {
+  setUp(() {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+  });
+
+  test('no stored choice keeps the device locale', () async {
+    final controller = LocaleController();
+    var notifications = 0;
+    controller.addListener(() => notifications++);
+
+    await controller.load();
+
+    expect(controller.locale, isNull);
+    expect(notifications, 1);
+  });
+
+  test('a chosen language survives a restart', () async {
+    final first = LocaleController();
+    await first.select('zh');
+    expect(first.locale, const Locale('zh'));
+
+    final reopened = LocaleController();
+    await reopened.load();
+    expect(reopened.locale, const Locale('zh'));
+  });
+
+  test('selecting english clears a stored chinese preference', () async {
+    await LocaleController().select('zh');
+
+    final reopened = LocaleController();
+    await reopened.load();
+    await reopened.select('en');
+
+    final third = LocaleController();
+    await third.load();
+    expect(third.locale, const Locale('en'));
+  });
+
+  test('an unsupported code clears the locale instead of throwing', () async {
+    final controller = LocaleController();
+    await controller.select('zh');
+    expect(controller.locale, const Locale('zh'));
+
+    await controller.select('tlh');
+
+    expect(controller.locale, isNull);
+  });
+
+  test('an unsupported stored code resolves to the device locale', () async {
+    await SharedPreferencesAsync().setString('ui.locale', 'fr');
+
+    final controller = LocaleController();
+    await controller.load();
+
+    expect(controller.locale, isNull);
+  });
+
+  test('a broken preference store never breaks load or select', () async {
+    SharedPreferencesAsyncPlatform.instance = _BrokenPreferences();
+    final controller = LocaleController();
+
+    await controller.load();
+    expect(controller.locale, isNull);
+
+    await controller.select('zh');
+    expect(controller.locale, const Locale('zh'));
+  });
+}
+
+/// Stands in for a platform whose preference store is unavailable.
+base class _BrokenPreferences extends InMemorySharedPreferencesAsync {
+  _BrokenPreferences() : super.empty();
+
+  @override
+  Future<String?> getString(String key, SharedPreferencesOptions options) =>
+      Future<String?>.error(StateError('preferences unavailable'));
+
+  @override
+  Future<bool> setString(
+    String key,
+    String value,
+    SharedPreferencesOptions options,
+  ) => Future<bool>.error(StateError('preferences unavailable'));
+}