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/features/auth/presentation/auth_controller.g.dart

@@ -0,0 +1,28 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'auth_controller.dart';
+
+// **************************************************************************
+// RiverpodGenerator
+// **************************************************************************
+
+String _$authControllerHash() => r'35d9a474535207949af85ca44019d70f50afd7c2';
+
+/// 登录状态控制器。
+///
+/// Copied from [AuthController].
+@ProviderFor(AuthController)
+final authControllerProvider =
+    AsyncNotifierProvider<AuthController, AuthState>.internal(
+      AuthController.new,
+      name: r'authControllerProvider',
+      debugGetCreateSourceHash: const bool.fromEnvironment('dart.vm.product')
+          ? null
+          : _$authControllerHash,
+      dependencies: null,
+      allTransitiveDependencies: null,
+    );
+
+typedef _$AuthController = AsyncNotifier<AuthState>;
+// ignore_for_file: type=lint
+// ignore_for_file: subtype_of_sealed_class, invalid_use_of_internal_member, invalid_use_of_visible_for_testing_member, deprecated_member_use_from_same_package