feat: update backend OCR parser, web app, mobile app camera/preview UI, tests, and documentation with sample images

test/camera_settings_test.dart

@@ -0,0 +1,28 @@
+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/camera_screen.dart';
+
+void main() {
+  testWidgets('CameraScreen renders basic UI elements with camera and gallery buttons', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const ProviderScope(
+        child: MaterialApp(
+          home: CameraScreen(),
+        ),
+      ),
+    );
+
+    // Verify Title exists
+    expect(find.text('OCR Document Scanner'), findsOneWidget);
+
+    // Verify main card header exists
+    expect(find.text('Pindai Dokumen DO'), findsOneWidget);
+
+    // Verify Camera button exists
+    expect(find.text('Ambil Foto Kamera'), findsOneWidget);
+
+    // Verify Gallery button exists
+    expect(find.text('Pilih Dari Galeri'), findsOneWidget);
+  });
+}