feat: implement WooCommerce storefront foundation

shop/xshop-theme/woocommerce/single-product.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * Single product — wrapper delegates to Woo hooks + XShop gallery/layout.
+ *
+ * We keep Woo's core hooks (woocommerce_before_single_product, etc.) and
+ * render XShop gallery + summary via components. No business logic rewrite.
+ *
+ * WC version tested: 11.1.0
+ * Template version: 1.6.4
+ */
+
+defined('ABSPATH') || exit;
+
+get_header('shop');
+
+do_action('woocommerce_before_main_content');
+
+while (have_posts()) {
+    the_post();
+    wc_get_template_part('content', 'single-product');
+}
+
+do_action('woocommerce_after_main_content');
+
+get_footer('shop');