feat(seo): add SEO controller for robots.txt and sitemap.xml

- Implemented SeoController with methods for serving robots.txt and sitemap.xml.
- Updated robots.txt logic to disallow access to /admin and /api paths.
- Enhanced meta tags and Open Graph data in home.html.twig for better SEO.
- Added X-Robots-Tag header in SecurityHeadersSubscriber for /admin and /api routes.

src/Shared/EventSubscriber/SecurityHeadersSubscriber.php

@@ -29,6 +29,10 @@ class SecurityHeadersSubscriber implements EventSubscriberInterface
         if (str_starts_with($path, '/api') && !str_starts_with($path, '/api/doc')) {
             $response->headers->set('Content-Security-Policy', "default-src 'none'");
         }
+
+        if (str_starts_with($path, '/admin') || str_starts_with($path, '/api')) {
+            $response->headers->set('X-Robots-Tag', 'noindex, nofollow');
+        }
     }
 
     public static function getSubscribedEvents(): array