[Feature] Support standard OpenAI API sampling parameters for thinker stage. (max_tokens...) (#450)

Signed-off-by: wonjae.lee0 <wonjae.lee0@navercorp.com>
Co-authored-by: wonjae.lee0 <wonjae.lee0@navercorp.com>

docs/serving/image_generation_api.md

@@ -233,10 +233,10 @@ Run the test suite to verify functionality:
 
 ```bash
 # All image generation tests
-pytest tests/entrypoints/openai/test_image_server.py -v
+pytest tests/entrypoints/openai_api/test_image_server.py -v
 
 # Specific test
-pytest tests/entrypoints/openai/test_image_server.py::test_generate_single_image -v
+pytest tests/entrypoints/openai_api/test_image_server.py::test_generate_single_image -v
 ```
 
 ## Development