feat: consolidate backend and docker-compose setup

test/camera_navigation_test.dart

@@ -0,0 +1,52 @@
+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/camera_screen.dart';
+import 'package:app_pfm_ocr_v2/features/camera/image_preview_screen.dart';
+
+void main() {
+  testWidgets('CameraScreen navigation to ImagePreviewScreen test', (WidgetTester tester) async {
+    // Generate a valid 1x1 PNG file in temp directory
+    final tempDir = Directory.systemTemp.createTempSync();
+    final tempFile = File('${tempDir.path}/test_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);
+
+    // Build a mock version of the widget tree with a simple navigator
+    await tester.pumpWidget(
+      const ProviderScope(
+        child: MaterialApp(
+          home: Scaffold(
+            body: CameraScreen(),
+          ),
+        ),
+      ),
+    );
+
+    // Find the state of the CameraScreen
+    final CameraScreenState state = tester.state(find.byType(CameraScreen));
+    
+    // Call the navigation method directly to test the routing
+    state.navigateToPreview(tempFile.path);
+    
+    // Pump frames to allow navigation and async processing to complete
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 500)); // Pushes preview screen
+    await tester.pump(const Duration(seconds: 1));          // Waits for blur analysis to finish
+
+    // Verify that the ImagePreviewScreen is now displayed on top of the navigator
+    expect(find.byType(ImagePreviewScreen), findsOneWidget);
+
+    // Cleanup
+    try {
+      tempFile.deleteSync();
+      tempDir.deleteSync();
+    } catch (_) {}
+  });
+}