Fixes: 1) Replace usage of `slugify` with direct access to `obj.slug` in sitemap location methods;
Extra: 1) Remove unused `slugify` import from `core/sitemaps.py`.
Removed the UUID component from product URLs in the sitemap to enhance readability and improve user experience. This change ensures cleaner, more user-friendly links without impacting functionality.
Introduce a unique, auto-generated slug field to the Product model, populated from category, brand, and name. Update core filters, serializers, sitemaps, and GraphQL object types to support the new slug functionality. Also, enforce HTTP-only cookies for session, CSRF, and language for improved security.
