feat: initialize new Flutter project with core feature structure and cross-platform configuration

test/widget_test.dart

@@ -0,0 +1,10 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fastwatcher/main.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+void main() {
+  testWidgets('Setup screen smoke test', (WidgetTester tester) async {
+    await tester.pumpWidget(const ProviderScope(child: FastWatcherApp()));
+    expect(find.text('FastWatcher'), findsOneWidget);
+  });
+}