docs(webrtc_controller_flutter): 更新项目文档以反映重构后的架构

AGENTS.md 与 README.md 同步更新：根据实际代码结构重写目录树、技术栈、架构分层及编码规范，移除旧版内联示例并补充新的开发约定与代码生成命令。

webrtc_controller_flutter/lib/app/app.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:webrtc_controller_flutter/l10n/app_localizations.dart';
+
+import 'router/app_router.dart';
+import 'theme/app_theme.dart';
+
+/// 应用根组件：CupertinoApp + GoRouter。
+class WebrtcControllerApp extends StatelessWidget {
+  const WebrtcControllerApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoApp.router(
+      title: 'WebRTC 控制端',
+      theme: AppTheme.light,
+      localizationsDelegates: const [
+        AppLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+      ],
+      supportedLocales: const [
+        Locale('zh'),
+        Locale('en'),
+      ],
+      routerConfig: appRouter,
+    );
+  }
+}