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>

autoload/Domain/Category/CategoryRepository.php

@@ -763,4 +763,43 @@ class CategoryRepository
 
         return $fallback ? (string)$fallback : '';
     }
+
+    public function getCategoryProductIds(int $categoryId): array
+    {
+        if ($categoryId <= 0) {
+            return [];
+        }
+
+        $result = $this->db->select('pp_shop_products_categories', 'product_id', ['category_id' => $categoryId]);
+
+        return is_array($result) ? $result : [];
+    }
+
+    public function subcategoriesLangCached(int $categoryId): array
+    {
+        $cacheHandler = new \Shared\Cache\CacheHandler();
+        $cacheKey = "subcategories_lang:{$categoryId}";
+        $cached = $cacheHandler->get($cacheKey);
+
+        if ($cached) {
+            return unserialize($cached);
+        }
+
+        $categories = $this->db->select('pp_shop_categories', '*', ['parent_id' => $categoryId]);
+        if (!is_array($categories)) {
+            return [];
+        }
+
+        $result = [];
+        foreach ($categories as $cat) {
+            $lang = $this->db->get('pp_shop_categories_langs', '*', ['category_id' => $cat['id']]);
+            if (is_array($lang)) {
+                $result[] = $lang;
+            }
+        }
+
+        $cacheHandler->set($cacheKey, $result);
+
+        return $result;
+    }
 }