feat(client): 关于我们内容改用配置文件 + 窗口标题改岩美酒库

- 新增 assets/config/app_info.json（服务商/网站/邮箱真实值），启动时
  AppInfo.load() 读取，不硬编码、不走环境变量
- 关于我们/续费/反馈处的服务商、网站、邮箱统一读配置
- Windows 窗口标题 jiu_client -> 岩美酒库（u8 + UTF-8→UTF-16 防乱码）

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/main.dart

@@ -4,6 +4,7 @@ import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_web_plugins/url_strategy.dart';
 import 'core/auth/auth_state.dart';
+import 'core/config/app_info.dart';
 import 'core/errors/error_reporter.dart';
 import 'core/router/app_router.dart';
 import 'core/theme/app_theme.dart';
@@ -24,7 +25,11 @@ void main() {
   };
 
   runZonedGuarded(
-    () => runApp(const ProviderScope(child: JiuApp())),
+    () async {
+      WidgetsFlutterBinding.ensureInitialized();
+      await AppInfo.load(); // 从配置文件加载「关于我们」品牌信息
+      runApp(const ProviderScope(child: JiuApp()));
+    },
     (error, stack) {
       debugPrint('═══ Zone Error ═══════════════════════════════');
       debugPrint(error.toString());