fix: update domain DNS handling and improve custom domain retrieval logic

Author: selul

inc/admin.php

@@ -1389,7 +1389,9 @@ private function localize_dashboard_app() {
 		$lang_code = isset( $available_languages[ $language ] ) ? 'de' : 'en';
 
 		$site_settings = $this->settings->get_site_settings();
-		$service_data['domain_dns'] = ltrim( Optml_Config::$service_url, 'https://' );
+		if ( ! empty( $service_data ) ) {
+			$service_data['domain_dns'] = $this->settings->get_cdn_url();
+		}
 		return [
 			'strings'                    => $this->get_dashboard_strings(),
 			'assets_url'                 => OPTML_URL . 'assets/',

inc/settings.php

@@ -714,14 +714,14 @@ public function get_cdn_url() {
 			return '';
 		}
 
-		if ( isset( $service_data['is_cname_assigned'] ) && $service_data['is_cname_assigned'] === 'yes' && ! empty( $service_data['domain'] ) ) {
-			return strtolower( $service_data['domain'] );
-		}
-
 		if ( defined( 'OPTML_CUSTOM_DOMAIN' ) && constant( 'OPTML_CUSTOM_DOMAIN' ) ) {
 			return parse_url( strtolower( OPTML_CUSTOM_DOMAIN ), PHP_URL_HOST );
 		}
 
+		if ( isset( $service_data['is_cname_assigned'] ) && $service_data['is_cname_assigned'] === 'yes' && ! empty( $service_data['domain'] ) ) {
+			return strtolower( $service_data['domain'] );
+		}
+
 		return sprintf(
 			'%s.%s',
 			strtolower( $service_data['cdn_key'] ),