Initial commit: Captain Claude Mobile App

- Flutter app with chat and terminal screens
- WebSocket integration for real-time chat
- xterm integration for screen sessions
- Markdown rendering with code blocks
- JWT authentication

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/services/api_service.dart

@@ -0,0 +1,82 @@
+import 'package:dio/dio.dart';
+import '../config/api_config.dart';
+import '../models/session.dart';
+import '../models/message.dart';
+
+class ApiService {
+  late final Dio _dio;
+  String? _token;
+
+  ApiService() {
+    _dio = Dio(BaseOptions(
+      baseUrl: ApiConfig.baseUrl,
+      connectTimeout: ApiConfig.connectionTimeout,
+      receiveTimeout: ApiConfig.receiveTimeout,
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    ));
+
+    _dio.interceptors.add(InterceptorsWrapper(
+      onRequest: (options, handler) {
+        if (_token != null) {
+          options.headers['Authorization'] = 'Bearer $_token';
+        }
+        return handler.next(options);
+      },
+      onError: (error, handler) {
+        if (error.response?.statusCode == 401) {
+          // Token expired, trigger re-login
+        }
+        return handler.next(error);
+      },
+    ));
+  }
+
+  void setToken(String? token) {
+    _token = token;
+  }
+
+  Future<Map<String, dynamic>> login(String username, String password) async {
+    final response = await _dio.post(
+      ApiConfig.login,
+      data: {
+        'username': username,
+        'password': password,
+      },
+    );
+    return response.data;
+  }
+
+  Future<List<ScreenSession>> getSessions() async {
+    final response = await _dio.get(ApiConfig.sessions);
+    return (response.data as List)
+        .map((json) => ScreenSession.fromJson(json))
+        .toList();
+  }
+
+  Future<List<Conversation>> getHistory({int limit = 20}) async {
+    final response = await _dio.get(
+      ApiConfig.history,
+      queryParameters: {'limit': limit},
+    );
+    return (response.data as List)
+        .map((json) => Conversation.fromJson(json))
+        .toList();
+  }
+
+  Future<List<Message>> getConversationMessages(String conversationId) async {
+    final response = await _dio.get('${ApiConfig.history}/$conversationId');
+    return (response.data as List)
+        .map((json) => Message.fromJson(json))
+        .toList();
+  }
+
+  Future<Map<String, dynamic>> uploadFile(String filePath) async {
+    final formData = FormData.fromMap({
+      'file': await MultipartFile.fromFile(filePath),
+    });
+    final response = await _dio.post(ApiConfig.upload, data: formData);
+    return response.data;
+  }
+}