feat: consolidate backend and docker-compose setup

backend/pfm-web-app/src/app/page.tsx

@@ -0,0 +1,10 @@
+export const dynamic = "force-dynamic";
+
+export default function Home() {
+  return (
+    <div style={{ fontFamily: 'system-ui, sans-serif', padding: '2rem', textAlign: 'center' }}>
+      <h1>Prima Fresh Mart OCR API Gateway</h1>
+      <p>Status: Running</p>
+    </div>
+  );
+}