Initial project scaffold

Full-stack Dutch supermarket price tracker with FastAPI backend,
PostgreSQL/SQLAlchemy, Albert Heijn scraper, and Next.js frontend.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/postcss.config.mjs

@@ -0,0 +1,8 @@
+const config = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};
+
+export default config;