chore: prepare yanting monorepo handoff

lib/main.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+
+import 'app.dart';
+import 'data/api/report_data_source.dart';
+
+export 'app.dart';
+export 'data/api/report_data_source.dart';
+export 'data/models/models.dart';
+
+void main() {
+  runApp(MyApp(dataSource: RnbApiDataSource()));
+}