ver. 0.320: API słowniki — ensure_producer; ProductRepository — producer_name w odpowiedzi

- DictionariesApiController: nowy endpoint POST ensure_producer (znajdź lub utwórz producenta)
- ProducerRepository: metoda ensureProducerForApi()
- ProductRepository: pole producer_name w odpowiedzi GET product
- ApiRouter: wstrzyknięto ProducerRepository do DictionariesApiController
- Zaktualizowano docs/API.md

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

autoload/Domain/Product/ProductRepository.php

@@ -657,6 +657,7 @@ class ProductRepository
             'set_id' => $product['set_id'] !== null ? (int)$product['set_id'] : null,
             'product_unit_id' => $product['product_unit_id'] !== null ? (int)$product['product_unit_id'] : null,
             'producer_id' => $product['producer_id'] !== null ? (int)$product['producer_id'] : null,
+            'producer_name' => $this->resolveProducerName($product['producer_id']),
             'date_add' => $product['date_add'],
             'date_modify' => $product['date_modify'],
         ];
@@ -1121,6 +1122,21 @@ class ProductRepository
         return $result;
     }
 
+    /**
+     * Zwraca nazwę producenta po ID (null jeśli brak).
+     *
+     * @param mixed $producerId
+     * @return string|null
+     */
+    private function resolveProducerName($producerId): ?string
+    {
+        if (empty($producerId)) {
+            return null;
+        }
+        $name = $this->db->get('pp_shop_producer', 'name', ['id' => (int)$producerId]);
+        return ($name !== false && $name !== null) ? (string)$name : null;
+    }
+
     /**
      * Szczegóły produktu (admin) — zastępuje factory product_details().
      */