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/profile/ModelProfile.java

@@ -42,6 +42,6 @@ public record ModelProfile(
 	}
 	
 	public static enum ModelProvider {
-		OAI_TEXT_COMPLETION, OAI_CHAT_COMPLETION, OPENROUTER, OLLAMA;
+		OAI_TEXT_COMPLETION, OAI_CHAT_COMPLETION, OAI_RESPONSES, OPENROUTER, OLLAMA;
 	}
 }