React app that loads report.db (from the Python pipeline) and displays the SEO report.

1. Run the Python pipeline to generate report.db: from repo root, python -m src.
2. Copy report.db into public/: cp ../report.db public/.
3. Start dev server: npm run dev. Open the app and it will fetch /report.db.

npm run build → output in dist/. For deployment, place report.db next to index.html (same origin) so the app can fetch it.