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.

graphify-out/.graphify_labels.json

@@ -644,5 +644,25 @@
   "642": "Community 642",
   "643": "Community 643",
   "644": "Community 644",
-  "645": "Community 645"
+  "645": "Community 645",
+  "646": "Community 646",
+  "647": "Community 647",
+  "648": "Community 648",
+  "649": "Community 649",
+  "650": "Community 650",
+  "651": "Community 651",
+  "652": "Community 652",
+  "653": "Community 653",
+  "654": "Community 654",
+  "655": "Community 655",
+  "656": "Community 656",
+  "657": "Community 657",
+  "658": "Community 658",
+  "659": "Community 659",
+  "660": "Community 660",
+  "661": "Community 661",
+  "662": "Community 662",
+  "663": "Community 663",
+  "664": "Community 664",
+  "665": "Community 665"
 }