feat: 修复了插件需要外部Provider的问题；加上了一个简易的车控状态返回

lib/manager.dart

@@ -0,0 +1,52 @@
+import 'dart:async';
+import 'package:flutter/widgets.dart';
+
+import 'bloc/ai_chat_cubit.dart';
+import 'bloc/command_state.dart';
+import 'models/vehicle_cmd.dart';
+
+/// 车辆命令处理器抽象类
+abstract class VehicleCommandHandler {
+  AIChatCommandCubit? commandCubit;
+  /// 执行车辆控制命令
+  Future<(bool, Map<String, dynamic>?)> executeCommand(VehicleCommand command);
+}
+
+class AIChatAssistantManager {
+  static final AIChatAssistantManager _instance = AIChatAssistantManager._internal();
+
+  static AIChatAssistantManager get instance => _instance;
+
+  AIChatAssistantManager._internal() {
+    // 初始化代码
+    debugPrint('AIChatAssistant 单例创建');
+    _commandCubit = AIChatCommandCubit();
+  }
+
+  AIChatCommandCubit? _commandCubit;
+
+  VehicleCommandHandler? commandClient;
+
+  /// 初始化命令处理器
+  void setupCommandHandle({
+    required VehicleCommandHandler commandHandler,
+  }) {
+    commandClient = commandHandler;
+    commandClient?.commandCubit = _commandCubit;
+  }
+
+  /// 获取命令状态流
+  Stream<AIChatCommandState> get commandStateStream {
+    if (_commandCubit == null) {
+      throw StateError('AIChatAssistant 未初始化');
+    }
+    return _commandCubit!.stream;
+  }
+
+  /// 释放资源
+  void dispose() {
+    _commandCubit?.close();
+    _commandCubit = null;
+  }
+
+}