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/api/ApiRouter.php

@@ -100,7 +100,8 @@ class ApiRouter
                 $transportRepo = new \Domain\Transport\TransportRepository($db);
                 $paymentRepo = new \Domain\PaymentMethod\PaymentMethodRepository($db);
                 $attrRepo = new \Domain\Attribute\AttributeRepository($db);
-                return new Controllers\DictionariesApiController($statusRepo, $transportRepo, $paymentRepo, $attrRepo);
+                $producerRepo = new \Domain\Producer\ProducerRepository($db);
+                return new Controllers\DictionariesApiController($statusRepo, $transportRepo, $paymentRepo, $attrRepo, $producerRepo);
             },
         ];
     }