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

example/lib/main.dart

@@ -1,9 +1,48 @@
 import 'package:flutter/material.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:provider/provider.dart';
-import 'package:ai_chat_assistant/app.dart';
-import 'package:ai_chat_assistant/services/message_service.dart';
-import 'package:ai_chat_assistant/enums/vehicle_command_type.dart';
+import 'package:ai_chat_assistant/ai_chat_assistant.dart';
+
+class VehicleCommandClent extends VehicleCommandHandler {
+  @override
+  AIChatCommandCubit? get commandCubit => super.commandCubit;
+
+  @override
+  Future<(bool, Map<String, dynamic>?)> executeCommand(VehicleCommand command) async {
+    // 在这里实现具体的车控命令执行逻辑
+    print('执行车控命令: ${command.type}, 参数: ${command.params}');
+
+    if (commandCubit != null) {
+
+      commandCubit?.emit(AIChatCommandState(
+        commandId: command.commandId,
+        commandType: command.type,
+        params: command.params,
+        status: AIChatCommandStatus.executing,
+        timestamp: DateTime.now(),
+        errorMessage: null,
+        result: null,
+      ));
+    }
+
+    // 模拟命令执行完成
+    await Future.delayed(const Duration(seconds: 2));
+
+    if (commandCubit != null) {
+      commandCubit?.emit(AIChatCommandState(
+        commandId: command.commandId,
+        commandType: command.type,
+        params: command.params,
+        status: AIChatCommandStatus.success,
+        timestamp: DateTime.now(),
+        errorMessage: null,
+        result: {'message': '命令执行成功'},
+      ));
+    }
+
+    return Future.value((true, {'message': '命令已执行'}));
+  }
+}
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -14,20 +53,17 @@ void main() async {
   }
 
   // 初始化 AI Chat Assistant，注册车控命令回调
-  ChatAssistantApp.initialize(
-    commandCallback: (VehicleCommandType type, Map<String, dynamic>? params) async {
-      // 这里是示例的车控命令处理逻辑
-      print('收到车控命令: $type, 参数: $params');
-      return Future.value((true, {'message': '命令已执行'}));
-    },
-  );
+  // ChatAssistantApp.initialize(
+  //   commandCallback: (VehicleCommandType type, Map<String, dynamic>? params) async {
+  //     // 这里是示例的车控命令处理逻辑
+  //     print('收到车控命令: $type, 参数: $params');
+  //     return Future.value((true, {'message': '命令已执行'}));
+  //   },
+  // );
 
-  runApp(
-    ChangeNotifierProvider(
-      create: (_) => MessageService(),
-      child: const MyApp(),
-    ),
-  );
+  AIChatAssistantManager.instance.setupCommandHandle(commandHandler: VehicleCommandClent());
+
+  runApp(const MyApp());
 }
 
 class MyApp extends StatelessWidget {