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/connection/presentation/connection_controller.g.dart

@@ -0,0 +1,29 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'connection_controller.dart';
+
+// **************************************************************************
+// RiverpodGenerator
+// **************************************************************************
+
+String _$connectionControllerHash() =>
+    r'bea162831e84bb80f7921d7c774d76e07969b023';
+
+/// 连接控制会话控制器：编排信令 + WebRTC，管理控制端全部 UI 状态。
+///
+/// Copied from [ConnectionController].
+@ProviderFor(ConnectionController)
+final connectionControllerProvider =
+    NotifierProvider<ConnectionController, ConnectionSessionState>.internal(
+      ConnectionController.new,
+      name: r'connectionControllerProvider',
+      debugGetCreateSourceHash: const bool.fromEnvironment('dart.vm.product')
+          ? null
+          : _$connectionControllerHash,
+      dependencies: null,
+      allTransitiveDependencies: null,
+    );
+
+typedef _$ConnectionController = Notifier<ConnectionSessionState>;
+// 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