feat: consolidate backend and docker-compose setup

lib/core/network/api_client.dart

@@ -0,0 +1,74 @@
+import 'package:dio/dio.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import '../../config/app_config.dart';
+
+class ApiClient {
+  late final Dio _dio;
+
+  ApiClient() {
+    _dio = Dio(
+      BaseOptions(
+        baseUrl: AppConfig.apiBaseUrl,
+        connectTimeout: const Duration(seconds: 10),
+        receiveTimeout: const Duration(minutes: 2),
+        headers: {
+          'Content-Type': 'application/json',
+          'Accept': 'application/json',
+        },
+      ),
+    );
+
+    _setupInterceptors();
+  }
+
+  void _setupInterceptors() {
+    // Request interceptor to append JWT token
+    _dio.interceptors.add(InterceptorsWrapper(
+      onRequest: (options, handler) async {
+        final prefs = await SharedPreferences.getInstance();
+        final token = prefs.getString('auth_token');
+        if (token != null) {
+          options.headers['Authorization'] = 'Bearer $token';
+        }
+        return handler.next(options);
+      },
+    ));
+
+    // Logging interceptor for debugging
+    _dio.interceptors.add(LogInterceptor(
+      requestBody: true,
+      responseBody: true,
+    ));
+
+    // Standardized Error Interceptor
+    _dio.interceptors.add(InterceptorsWrapper(
+      onError: (DioException e, handler) {
+        String errorMessage = 'An unexpected error occurred';
+        if (e.type == DioExceptionType.connectionTimeout || 
+            e.type == DioExceptionType.receiveTimeout) {
+          errorMessage = 'Connection timed out. Please try again.';
+        } else if (e.response != null) {
+          // Standardized HTTP error formatting
+          final statusCode = e.response?.statusCode;
+          errorMessage = 'Server error ($statusCode): ${e.response?.data['message'] ?? 'Unknown'}';
+        } else if (e.type == DioExceptionType.connectionError) {
+          errorMessage = 'No internet connection.';
+        }
+        
+        final customError = DioException(
+          requestOptions: e.requestOptions,
+          response: e.response,
+          type: e.type,
+          error: errorMessage,
+        );
+        return handler.next(customError);
+      },
+    ));
+
+    // Dummy Response Interceptor for Development
+    // TODO: Remove this interceptor before production release
+    // _dio.interceptors.add(DummyResponseInterceptor());
+  }
+
+  Dio get client => _dio;
+}

lib/core/network/dummy_response_interceptor.dart

@@ -0,0 +1,70 @@
+import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
+
+/// Interceptor to simulate a 5-second delayed OCR processing response.
+/// This will only intercept POST requests to the upload document endpoint.
+class DummyResponseInterceptor extends Interceptor {
+  @override
+  Future<void> onRequest(RequestOptions options, RequestInterceptorHandler handler) async {
+    // Check if it's the upload document endpoint
+    if (options.path.contains('/documents/upload')) {
+      debugPrint('Simulating 5-second processing delay for OCR...');
+      
+      // Simulate 5 seconds delay
+      await Future.delayed(const Duration(seconds: 5));
+      
+      // Create a dummy successful response based on user schema requirements
+      final dummyData = {
+        'status': 'success',
+        'message': 'Document processed successfully',
+        'data': {
+          'header': {
+            'tanggal': '16 April 2026',
+            'no_po': 'PO/26/0000140731',
+            'no_so': '1691869400',
+            'no_do': '1659896184'
+          },
+          'shipment': {
+            'kepada_yth': 'PT.PRIMAFOOD INTERNATIONAL DKI AREA',
+            'order_untuk': '',
+            'alamat': 'JL. ANCOL BARAT VIII/1, ANCOL, PADEMANGAN, JAKARTA UTARA, 14430',
+            'plat_truk': 'B 9310 BXT'
+          },
+          'items': [
+            {
+              'nomor_sku': '12080101',
+              'nama_barang': '920 FIESTA SPICY CHICK 400 G',
+              'banyak': '1 BOX',
+              'jumlah': '12 PAC'
+            },
+            {
+              'nomor_sku': '13010513',
+              'nama_barang': '304 Champ Chicken Sausage 375 Gr 15 Pack',
+              'banyak': '1 BOX',
+              'jumlah': '15 PAC'
+            },
+            {
+              'nomor_sku': '13030502',
+              'nama_barang': '298 Champ Chicken Ball 500 GR Fr',
+              'banyak': '1 BOX',
+              'jumlah': '10 PAC'
+            }
+          ]
+        }
+      };
+
+      debugPrint('Dummy response generated');
+      
+      return handler.resolve(
+        Response(
+          requestOptions: options,
+          data: dummyData,
+          statusCode: 200,
+        ),
+      );
+    }
+    
+    // For other requests, continue normally
+    super.onRequest(options, handler);
+  }
+}