feat: 新增ai_chat_core，将core 和 widget 分离（未完成）

迁移了 models enums， utils， http 封装，还有一些extensions；service 只迁移了 sse service

lib/services/chat_sse_service.dart

@@ -3,7 +3,7 @@ import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
 
-import 'package:ai_chat_assistant/utils/tts_util.dart';
+import '../utils/tts_util.dart';
 
 import '../utils/common_util.dart';
 

lib/services/command_service.dart

@@ -1,5 +1,5 @@
-import '../enums/vehicle_command_type.dart';
-import '../models/vehicle_status_info.dart';
+import 'package:ai_chat_core/ai_chat_core.dart';
+
 
 /// 命令处理回调函数定义
 typedef CommandCallback = Future<(bool, Map<String, dynamic>? params)> Function(

lib/services/control_recognition_service.dart

@@ -1,8 +1,6 @@
 import 'dart:convert';
+import 'package:ai_chat_core/ai_chat_core.dart';
 import 'package:http/http.dart' as http;
-import '../models/vehicle_cmd.dart';
-import '../models/vehicle_cmd_response.dart';
-import 'vehicle_state_service.dart';
 
 /// 车辆命令服务 - 负责与后端交互以获取和处理车辆控制命令
 class VehicleCommandService {

lib/services/message_service.dart

@@ -8,14 +8,17 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:uuid/uuid.dart';
-import '../services/chat_sse_service.dart';
+import '../services/chat_sse_service.dart' as Service;
 import '../services/classification_service.dart';
 import '../services/control_recognition_service.dart';
 // import '../services/audio_recorder_service.dart';
 // import '../services/voice_recognition_service.dart';
-import 'command_service.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 
+import 'platform_tts_service.dart';
+
+const aliSdkChannelName = 'com.example.ai_chat_assistant/ali_sdk';
+
 // 用单例的模式创建
 class MessageService extends ChangeNotifier {
   static const MethodChannel _asrChannel = MethodChannel('com.example.ai_chat_assistant/ali_sdk');
@@ -77,7 +80,9 @@ class MessageService extends ChangeNotifier {
     }
   }
 
-  final ChatSseService _chatSseService = ChatSseService();
+  // final ChatSseService _chatSseService = ChatSseService(PlatformTtsService(aliSdkChannelName));
+  final Service.ChatSseService _chatSseService = Service.ChatSseService();
+
   // final LocalTtsService _ttsService = LocalTtsService();
   // final AudioRecorderService _audioService = AudioRecorderService();
   // final VoiceRecognitionService _recognitionService = VoiceRecognitionService();

lib/services/platform_tts_service.dart

@@ -0,0 +1,36 @@
+import 'package:ai_chat_core/ai_chat_core.dart';
+import 'package:flutter/services.dart';
+
+/// TtsService 的平台特定实现，通过 MethodChannel 调用原生代码
+class PlatformTtsService implements TtsService {
+  @override
+  final String channelName;
+
+  final MethodChannel _channel;
+
+  PlatformTtsService(this.channelName): _channel = MethodChannel(channelName);
+
+  Future<T?> _execute<T>(String method, [Map<Object, Object>? arguments]) {
+    return _channel.invokeMethod(method, arguments);
+  }
+
+  @override
+  Future<bool> start(bool isChinese) async {
+    return await _execute('startTts', {'isChinese': isChinese}) ?? false;
+  }
+
+  @override
+  Future<void> send(String text) async {
+    await _execute('sendTts', {'text': text});
+  }
+
+  @override
+  Future<void> complete() async {
+    await _execute('completeTts');
+  }
+
+  @override
+  Future<void> stop() async {
+    await _execute('stopTts');
+  }
+}

lib/services/tts_service.dart

@@ -6,6 +6,7 @@ import 'package:ai_chat_assistant/utils/common_util.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_tts/flutter_tts.dart';
 
+@Deprecated('Use TtsService interface and its implementations instead')
 class LocalTtsService {
   final FlutterTts _flutterTts = FlutterTts();
   bool _isPlaying = false;

lib/services/voice_recognition_service.dart

@@ -2,6 +2,7 @@ import 'package:http/http.dart' as http;
 import 'dart:convert';
 import 'package:http_parser/http_parser.dart';
 
+@Deprecated('VoiceRecognitionService is deprecated, please use the new implementation if available.')
 class VoiceRecognitionService {
   Future<String?> recognizeSpeech(List<int> audioBytes,
       {String lang = 'cn'}) async {