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>

templates/shop-product/_partial/product-meta.php

@@ -1,6 +1,5 @@
 <?php
-    use shop\Product;
-    $product_meta = Product::product_meta($this->product_id);
+    $product_meta = ( new \Domain\Product\ProductRepository( $GLOBALS['mdb'] ) )->productMeta( $this->product_id );
 ?>
 
 <?php if (is_array($product_meta) && count($product_meta)): ?>