Add Bootstrap 5 single product page layout

Add two-column responsive grid (image gallery + product summary) for
single product pages, following the same bridge pattern used for
product archives.

Key changes:
- Create content-single-product.php bridge and Twig layout template
- Add single product renderer at template_redirect priority 11
- Disable WooCommerce block compatibility layer that strips classic
  hooks when parent theme has theme.json
- Move PHP templates to woocommerce/ subfolder for cleaner structure
- Fix Twig templates to self-compute context data not passed by
  wc_get_template() (tabs, short-description, meta, rating)
- Fix Underscore.js triple-brace syntax conflict in variation template
  by wrapping in {% verbatim %}

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

woocommerce/content-product.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * Product Content in Loop — PHP Bridge to Twig
+ *
+ * Bridge file that renders the Bootstrap 5 card template (content-product.html.twig)
+ * via the parent theme's TwigService instead of WooCommerce's default <li> markup.
+ *
+ * WooCommerce's wc_get_template_part('content', 'product') uses locate_template()
+ * which finds this file in the child theme before falling back to the plugin template.
+ * Unlike wc_get_template(), wc_get_template_part() does NOT fire the
+ * woocommerce_before_template_part / woocommerce_after_template_part hooks,
+ * so the TemplateOverride class cannot intercept it — this bridge file is needed.
+ *
+ * @package WcBootstrap
+ * @since 0.1.0
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+global $product;
+
+// Ensure the product is valid and visible (same guard as WooCommerce's default template).
+if ( ! is_a( $product, WC_Product::class ) || ! $product->is_visible() ) {
+	return;
+}
+
+if ( class_exists( '\WPBootstrap\Twig\TwigService' ) ) {
+	$twig = \WPBootstrap\Twig\TwigService::getInstance();
+	echo $twig->render( 'content-product.html.twig', [] );
+} else {
+	// Fallback: include WooCommerce's default template directly.
+	include WC()->plugin_path() . '/templates/content-product.php';
+}