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.
Replaced `fields = "__all__"` with specific fields for better control and security. Removed unused `filter_fields` to clean up the code and align with actual requirements. These changes improve maintainability and clarity.
