Add native cookie consent and move hero intro above CTA

- Restore CookieConsent banner behavior with the new dependency
- Reposition the right-panel intro above the Projekt anfragen button
- Add focused tests and update build metadata

src/pages/index.astro

@@ -22,5 +22,9 @@ import "@/styles/global.css";
       <LandingHeroSection client:media="(min-width: 1024px)" />
       <LandingRest />
     </main>
+    <script>
+      import { initCookieInfoBanner } from "@/lib/cookie-banner-info";
+      initCookieInfoBanner();
+    </script>
   </body>
 </html>