ver. 0.294: Remove all 12 legacy autoload/shop/ classes (~2363 lines)

Complete Domain-Driven Architecture migration:
- Phase 1-4: Transport, ProductSet, Coupon, Shop, Search, Basket,
  ProductCustomField, Category, ProductAttribute, Promotion
- Phase 5: Order (~562 lines) + Product (~952 lines)
- ~20 Product methods migrated to ProductRepository
- Apilo sync migrated to OrderAdminService
- Production hotfixes: stale Redis cache (prices 0.00), unqualified
  Product:: refs in LayoutEngine, object->array template conversion
- AttributeRepository::getAttributeValueById() Redis cache added

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

index.php

@@ -222,7 +222,7 @@ if ( $settings[ 'piksel' ] )
       "ViewCategory", {
         content_category: "kategoria",
         content_name: "' . htmlspecialchars( str_replace( '"', '', ( new \Domain\Category\CategoryRepository( $GLOBALS['mdb'] ) )->categoryName( (int)$category['id'], $lang_id ) ) ) . '",
-        content_ids: ["' . implode( ',', \shop\Category::get_category_products_id( $category['id'] ) ) . '"],
+        content_ids: ["' . implode( ',', ( new \Domain\Category\CategoryRepository( $GLOBALS['mdb'] ) )->getCategoryProductIds( (int)$category['id'] ) ) . '"],
         content_type: "product"
       });';