feat: consolidate backend and docker-compose setup

test/preview_validation_test.dart

@@ -0,0 +1,84 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:app_pfm_ocr_v2/features/camera/image_preview_screen.dart';
+import 'package:app_pfm_ocr_v2/features/camera/blur_detector.dart';
+
+void main() {
+  late Directory tempDir;
+  late File tempFile;
+
+  setUpAll(() {
+    tempDir = Directory.systemTemp.createTempSync();
+    tempFile = File('${tempDir.path}/test_preview_image.png');
+    final dummyPngBytes = [
+      137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 
+      0, 0, 0, 1, 0, 0, 0, 1, 8, 6, 0, 0, 0, 31, 21, 196, 137, 
+      0, 0, 0, 10, 73, 68, 65, 84, 120, 156, 99, 0, 1, 0, 0, 5, 
+      0, 1, 13, 10, 45, 180, 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96, 130
+    ];
+    tempFile.writeAsBytesSync(dummyPngBytes);
+  });
+
+  tearDownAll(() {
+    try {
+      tempFile.deleteSync();
+      tempDir.deleteSync();
+    } catch (_) {}
+  });
+
+  testWidgets('ImagePreviewScreen shows Blur Warning when image is blurry', (WidgetTester tester) async {
+    // Inject blurry mock result
+    BlurDetector.mockResult = BlurResult(score: 50.0, isBlur: true, rawScore: 250.0);
+
+    await tester.pumpWidget(
+      ProviderScope(
+        child: MaterialApp(
+          home: ImagePreviewScreen(imagePath: tempFile.path),
+        ),
+      ),
+    );
+
+    // Wait for analysis to finish
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1));
+
+    // Verify warning text is displayed
+    expect(find.text('Foto Terdeteksi Blur!'), findsOneWidget);
+    expect(find.text('Kualitas Foto Baik'), findsNothing);
+
+    // Verify "Unggah Dokumen" button is disabled (has null onPressed)
+    final uploadButton = tester.widget<ElevatedButton>(find.byType(ElevatedButton));
+    expect(uploadButton.onPressed, isNull);
+
+    BlurDetector.mockResult = null;
+  });
+
+  testWidgets('ImagePreviewScreen shows Sharp Success when image is clear', (WidgetTester tester) async {
+    // Inject sharp mock result
+    BlurDetector.mockResult = BlurResult(score: 95.0, isBlur: false, rawScore: 475.0);
+
+    await tester.pumpWidget(
+      ProviderScope(
+        child: MaterialApp(
+          home: ImagePreviewScreen(imagePath: tempFile.path),
+        ),
+      ),
+    );
+
+    // Wait for analysis to finish
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1));
+
+    // Verify success text is displayed
+    expect(find.text('Kualitas Foto Baik'), findsOneWidget);
+    expect(find.text('Foto Terdeteksi Blur!'), findsNothing);
+
+    // Verify "Unggah Dokumen" button is enabled (has non-null onPressed)
+    final uploadButton = tester.widget<ElevatedButton>(find.byType(ElevatedButton));
+    expect(uploadButton.onPressed, isNotNull);
+
+    BlurDetector.mockResult = null;
+  });
+}