feat: consolidate backend and docker-compose setup

lib/core/router/app_router.dart

@@ -0,0 +1,39 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../features/splash/splash_screen.dart';
+import '../../features/auth/login_screen.dart';
+import '../../features/camera/camera_screen.dart';
+import '../../features/documents/documents_screen.dart';
+import '../../features/editor/editor_screen.dart';
+
+final appRouterProvider = Provider<GoRouter>((ref) {
+  return GoRouter(
+    initialLocation: '/splash',
+    routes: [
+      GoRoute(
+        path: '/splash',
+        builder: (context, state) => const SplashScreen(),
+      ),
+      GoRoute(
+        path: '/login',
+        builder: (context, state) => const LoginScreen(),
+      ),
+      GoRoute(
+        path: '/camera',
+        builder: (context, state) => const CameraScreen(),
+      ),
+      GoRoute(
+        path: '/documents',
+        builder: (context, state) => const DocumentsScreen(),
+      ),
+      GoRoute(
+        path: '/editor',
+        builder: (context, state) {
+          final pendingId = state.extra as String?;
+          return EditorScreen(pendingId: pendingId);
+        },
+      ),
+    ],
+  );
+});