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/test/widget_test.dart

@@ -1,30 +1,18 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
 
-import 'package:webrtc_controller_flutter/main.dart';
+import 'package:webrtc_controller_flutter/app/app.dart';
 
 void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
+  testWidgets('App builds and shows setup page', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const ProviderScope(child: WebrtcControllerApp()),
+    );
     await tester.pump();
 
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
+    // 连接设置页（CupertinoPageScaffold + 导航栏）应正常渲染。
+    expect(find.byType(CupertinoPageScaffold), findsOneWidget);
+    expect(find.byType(CupertinoNavigationBar), findsOneWidget);
   });
 }