ver. 0.323: fix import zdjęć, trwałe usuwanie produktów, fix API upload path

- IntegrationsRepository: refactor importu zdjęć — walidacja HTTP, curl timeouty, logi, czytelny komunikat
- ProductRepository: saveCustomFields tylko gdy klucz istnieje (partial API update), delete() czyści custom_fields
- ProductArchiveController: przycisk i metoda delete_permanent() do trwałego usunięcia z archiwum
- ProductsApiController: fix ścieżki upload (api.php działa z rootu projektu)

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

autoload/Domain/Product/ProductRepository.php

@@ -1331,7 +1331,10 @@ class ProductRepository
             $this->saveImagesOrder( $productId, $d['gallery_order'] );
         }
 
-        $this->saveCustomFields( $productId, $d['custom_field_name'] ?? [], $d['custom_field_type'] ?? [], $d['custom_field_required'] ?? [] );
+        // Zapisz custom fields tylko gdy jawnie podane (partial update przez API może nie zawierać tego klucza)
+        if ( array_key_exists( 'custom_field_name', $d ) ) {
+            $this->saveCustomFields( $productId, $d['custom_field_name'] ?? [], $d['custom_field_type'] ?? [], $d['custom_field_required'] ?? [] );
+        }
 
         if ( !$isNew ) {
             $this->cleanupDeletedFiles( $productId );
@@ -1645,6 +1648,7 @@ class ProductRepository
         $this->db->delete( 'pp_shop_products_langs', [ 'product_id' => $productId ] );
         $this->db->delete( 'pp_shop_products_images', [ 'product_id' => $productId ] );
         $this->db->delete( 'pp_shop_products_files', [ 'product_id' => $productId ] );
+        $this->db->delete( 'pp_shop_products_custom_fields', [ 'id_product' => $productId ] );
         $this->db->delete( 'pp_shop_products_attributes', [ 'product_id' => $productId ] );
         $this->db->delete( 'pp_shop_products', [ 'id' => $productId ] );
         $this->db->delete( 'pp_shop_product_sets_products', [ 'product_id' => $productId ] );