refactor: use interface types for ApiService and GateService in DI

Register services with setType(Interface)->setFactory(Implementation)
so the container exposes ApiServiceInterface and GateServiceInterface
rather than concrete classes.

Author: trejjam

src/DI/ThePayExtension.php

@@ -6,7 +6,9 @@
 use Nette\Schema\Expect;
 use Nette\Schema\Schema;
 use ThePay\ApiClient\Service\ApiService;
+use ThePay\ApiClient\Service\ApiServiceInterface;
 use ThePay\ApiClient\Service\GateService;
+use ThePay\ApiClient\Service\GateServiceInterface;
 use ThePay\ApiClient\Service\SignatureService;
 use ThePay\ApiClient\TheClient;
 use ThePay\ApiClient\TheConfig;
@@ -58,10 +60,12 @@ public function beforeCompile(): void
 			->setType(SignatureService::class);
 
 		$builder->addDefinition($this->prefix('apiService'))
-			->setType(ApiService::class);
+			->setType(ApiServiceInterface::class)
+			->setFactory(ApiService::class);
 
 		$builder->addDefinition($this->prefix('gateService'))
-			->setType(GateService::class);
+			->setType(GateServiceInterface::class)
+			->setFactory(GateService::class);
 
 		$builder->addDefinition($this->prefix('client'))
 			->setType(TheClient::class);