Add Bootstrap 5 product archive with card grid and sidebar

Replace WooCommerce's default shop/category page rendering with a
Bootstrap 5 card grid layout featuring responsive columns, sale badges,
star ratings, and an offcanvas sidebar for filters on mobile.

Key implementation details:

- Bypass parent theme's TemplateController for product archives via
  wp_bootstrap_should_render_template filter, render at template_redirect
  priority 11 using the same page shell injection pattern as plugin pages

- Add archive-product.php (Bootstrap layout with optional sidebar) and
  content-product.php (PHP bridge for wc_get_template_part interception)

- Inject global $product into Twig context in TemplateOverride to fix
  empty price/add-to-cart/rating/sale-flash in loop sub-templates — Twig
  has isolated variable scopes and cannot access PHP globals directly

- Fix pagination URLs: use get_pagenum_link() instead of ?page= query
  param (WordPress uses 'paged' for archive pagination, not 'page')

- Fix double-escaped – in result count by adding |raw filter

- Reset WooCommerce float-based layout CSS (woocommerce-layout.css) for
  shop pages to prevent conflicts with Bootstrap flex grid

- Register shop-sidebar widget area with Bootstrap-styled markup

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

templates/content-product.html.twig

@@ -2,17 +2,17 @@
  # Product Content in Loop (Bootstrap 5 Override)
  #
  # Renders a single product card within the shop loop grid.
- # Uses Bootstrap 5 card component with stretched-link.
+ # Uses Bootstrap 5 card component with WooCommerce hook output.
  #
- # Expected context:
- #   product - WC_Product object with:
- #     .name           - Product name
- #     .permalink      - Product URL
- #     .image          - Product thumbnail HTML
- #     .price_html     - Formatted price HTML
- #     .rating_html    - Star rating HTML
- #     .is_on_sale     - Whether product is on sale
- #     .add_to_cart    - Add-to-cart button context
+ # Rendered via the content-product.php bridge file (not TemplateOverride)
+ # because wc_get_template_part() does not fire the template_part hooks.
+ #
+ # Hook output structure:
+ #   woocommerce_before_shop_loop_item       → <a> link open
+ #   woocommerce_before_shop_loop_item_title → sale badge, product image
+ #   woocommerce_shop_loop_item_title        → <h2> product title
+ #   woocommerce_after_shop_loop_item_title  → star rating, price
+ #   woocommerce_after_shop_loop_item        → </a> link close, add-to-cart button
  #
  # WooCommerce PHP equivalent: content-product.php
  #