Add initial project structure and configuration files for iOS and Android

lib/api/interceptors/auth_interceptor.dart

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+import 'package:dio/dio.dart';
+import '../../data/repositories/auth_repository.dart';
+
+class AuthInterceptor extends Interceptor {
+  final AuthRepository _authRepository;
+  final Dio _dio;
+  
+  AuthInterceptor(this._authRepository, this._dio);
+  
+  @override
+  Future<void> onRequest(
+    RequestOptions options, 
+    RequestInterceptorHandler handler,
+  ) async {
+    // Skip auth header for login and refresh endpoints
+    if (options.path.contains('/auth/login') || 
+        options.path.contains('/auth/refresh')) {
+      return handler.next(options);
+    }
+    
+    // Get token and add to request
+    final token = await _authRepository.getAccessToken();
+    if (token != null) {
+      options.headers['Authorization'] = 'Bearer $token';
+    }
+    
+    return handler.next(options);
+  }
+  
+  @override
+  Future<void> onError(
+    DioException err, 
+    ErrorInterceptorHandler handler,
+  ) async {
+    // Handle 401 errors by refreshing token and retrying
+    if (err.response?.statusCode == 401) {
+      // On 401, try to get a new token
+      final token = await _authRepository.getAccessToken();
+      
+      if (token != null) {
+        // If we have a new token, retry the request
+        final opts = err.requestOptions;
+        opts.headers['Authorization'] = 'Bearer $token';
+        
+        try {
+          final response = await _dio.fetch(opts);
+          return handler.resolve(response);
+        } on DioException catch (e) {
+          return handler.next(e);
+        }
+      }
+    }
+    
+    return handler.next(err);
+  }
+}

lib/api/services/auth_service.dart

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+import 'dart:developer';
+
+import 'package:dio/dio.dart';
+import '../../features/auth/models/auth_token.dart';
+import '../../features/auth/models/auth_credentials.dart';
+import '../../data/models/user.dart';
+import '../../core/errors/exceptions.dart';
+
+class AuthService {
+  final Dio _dio;
+
+  AuthService(this._dio);
+
+  Future<AuthToken> login(AuthCredentials credentials) async {
+    try {
+      final response = await _dio.post(
+        '/auth/login',
+        data: credentials.toJson(),
+      );
+      
+      if (response.statusCode == 200) {
+        return AuthToken.fromJson(response.data);
+      } else {
+        throw AuthException('Login failed');
+      }
+    } on DioException catch (e) {
+      if (e.response?.statusCode == 401) {
+        throw AuthException('Invalid credentials');
+      }
+      throw NetworkException('Network error during login');
+    } catch (e) {
+      throw UnexpectedException('Unexpected error during login: ${e.toString()}');
+    }
+  }
+
+  Future<AuthToken> refreshToken(String refreshToken) async {
+    try {
+      final response = await _dio.post(
+        '/auth/refresh',
+        data: {'refresh_token': refreshToken},
+      );
+      
+      if (response.statusCode == 200) {
+        return AuthToken.fromJson(response.data);
+      } else {
+        throw AuthException('Token refresh failed');
+      }
+    } catch (e) {
+      throw AuthException('Failed to refresh token: ${e.toString()}');
+    }
+  }
+
+  Future<void> logout(String refreshToken) async {
+    try {
+      await _dio.post(
+        '/auth/logout',
+        data: {'refresh_token': refreshToken},
+      );
+    } catch (e) {
+      // We might want to just log this error rather than throwing,
+      // as logout should succeed even if the server call fails
+      log('Logout error: ${e.toString()}');
+    }
+  }
+
+  Future<User> getUserProfile() async {
+    try {
+      final response = await _dio.get('/auth/profile');
+      
+      if (response.statusCode == 200) {
+        return User.fromJson(response.data);
+      } else {
+        throw AuthException('Failed to get user profile');
+      }
+    } catch (e) {
+      throw AuthException('Error fetching user profile: ${e.toString()}');
+    }
+  }
+}