feat: register do_shortcode() as Twig function (v1.0.7)

Adds do_shortcode to TwigService::registerWordPressFunctions() so child
themes and partials can render WordPress shortcodes directly inside Twig
templates via {{ do_shortcode('[shortcode]') }}.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

inc/Twig/TwigService.php

@@ -132,6 +132,10 @@ class TwigService
             return wp_kses_post($content);
         }, ['is_safe' => ['html']]));
 
+        $this->twig->addFunction(new TwigFunction('do_shortcode', function (string $content): string {
+            return do_shortcode($content);
+        }, ['is_safe' => ['html']]));
+
         // Formatting.
         $this->twig->addFunction(new TwigFunction('number_format_i18n', function (float $number, int $decimals = 0): string {
             return number_format_i18n($number, $decimals);