Add AI data source implementation

scribe/lib/scribe/ai/data/datasource_impl/ai_datasource_impl.dart

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+import 'package:dio/dio.dart';
+import '../datasource/ai_datasource.dart';
+import '../model/ai_message.dart';
+import '../model/ai_api_request.dart';
+import '../network/ai_api.dart';
+import '../../domain/model/ai_response.dart';
+import 'package:tmail_ui_user/main/utils/app_config.dart';
+
+class AIDataSourceImpl implements AIDataSource {
+  final AIApi _aiApi;
+
+  AIDataSourceImpl({
+    required Dio dio,
+  }) : _aiApi = AIApi(
+          dio: dio,
+          apiKey: AppConfig.aiApiKey,
+          baseUrl: AppConfig.aiApiUrl,
+        );
+
+  @override
+  Future<AIResponse> request(String prompt) async {
+    try {
+      final aiRequest = AIAPIRequest(
+        messages: [
+          AIMessage(
+            role: 'user',
+            content: prompt,
+          ),
+        ],
+      );
+
+      final apiResponse = await _aiApi.chatCompletion(aiRequest);
+      return AIResponse(result: apiResponse.content);
+    } on DioError catch (e) {
+      throw Exception('Failed to generate AI text: ${e.message}');
+    } catch (e) {
+      throw Exception('Failed to generate AI text: $e');
+    }
+  }
+}

scribe/lib/scribe/ai/data/network/ai_api.dart

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+import 'package:dio/dio.dart';
+import '../model/ai_api_response.dart';
+import '../model/ai_api_request.dart';
+
+class AIApi {
+  final Dio _dio;
+  final String _apiKey;
+  final String _baseUrl;
+
+  AIApi({
+    required Dio dio,
+    required String apiKey,
+    required String baseUrl,
+  })  : _dio = dio,
+        _apiKey = apiKey,
+        _baseUrl = baseUrl;
+
+  Future<AIApiResponse> chatCompletion(AIAPIRequest request) async {
+    final response = await _dio.post(
+      '$_baseUrl/chat/completions',
+      options: Options(
+        headers: {
+          'Authorization': 'Bearer $_apiKey',
+          'Content-Type': 'application/json',
+        },
+      ),
+      data: request.toJson(),
+    );
+
+    if (response.statusCode == 200) {
+      final parsedResponse = AIApiResponse.parse(response.data);
+      if (parsedResponse != null) {
+        return parsedResponse;
+      } else {
+        throw Exception('Empty response from AI service');
+      }
+    } else {
+      throw Exception('AI API returned status code: ${response.statusCode}');
+    }
+  }
+}