Subdomains now visible on domain management page

Subdomains are now organized in a dedicated Subdomains section on the DNS management page. The interface adapts based on subdomain type: subdomains created as separate websites display their own DNS management section, while regular subdomains or those created through domain redirects are managed under the main domain's DNS settings. If your main domain has hosting connected, you'll also see a Create subdomain button for quick access. This change keeps your domain structure organized in one logical place, making it easier to understand your setup and manage DNS without navigating between multiple pages.