feat: Add OAI_RESPONSES model provider and implement Responses API client tests

- Updated ModelProfile to include OAI_RESPONSES in the ModelProvider enum.
- Created CompletionClientTest to validate text and chat completion functionalities.
- Added ResponsesApiClientTest to test Responses API interactions, including model listing and conversation handling.
- Implemented ResponsesApiDialectTestConfiguration for managing reasoning efforts in tests.
- Updated application-test.properties to include a new profile for responses.
- Added local-responses.properties configuration for the Responses API.

src/main/java/de/extio/lmlib/client/ClientAutoConfiguration.java

@@ -11,6 +11,7 @@ import de.extio.lmlib.client.openrouter.OpenRouterModelDiscovery;
 import de.extio.lmlib.client.ollama.OllamaClient;
 import de.extio.lmlib.client.oai.completion.chat.ChatCompletionClient;
 import de.extio.lmlib.client.oai.completion.text.TextCompletionClient;
+import de.extio.lmlib.client.oai.responses.ResponsesApiClient;
 import de.extio.lmlib.profile.ProfileAutoConfiguration;
 import de.extio.lmlib.token.TokenizerAutoConfiguration;
 
@@ -37,6 +38,12 @@ public class ClientAutoConfiguration {
 		return new ChatCompletionClient();
 	}
 
+	@Bean
+	@ConditionalOnMissingBean
+	ResponsesApiClient responsesApiClient() {
+		return new ResponsesApiClient();
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	OpenRouterModelDiscovery openRouterModelDiscovery() {