### Test the root endpoint
GET http://localhost:8000/

### Test health check
GET http://localhost:8000/health

### Test LUT transformation endpoint
POST http://localhost:8000/transform-lut
Content-Type: application/json

{
  "cube_file_base64": "VElUTEUgIlRlc3QgTFVUIgpMVVRfM0RfU0laRSAyCgowLjAwMDAwMCAwLjAwMDAwMCAwLjAwMDAwMAowLjUwMDAwMCAwLjAwMDAwMCAwLjAwMDAwMAowLjAwMDAwMCAwLjUwMDAwMCAwLjAwMDAwMAowLjUwMDAwMCAwLjUwMDAwMCAwLjAwMDAwMAowLjAwMDAwMCAwLjAwMDAwMCAwLjUwMDAwMAowLjUwMDAwMCAwLjAwMDAwMCAwLjUwMDAwMAowLjAwMDAwMCAwLjUwMDAwMCAwLjUwMDAwMAoxLjAwMDAwMCAxLjAwMDAwMCAxLjAwMDAwMA==",
  "user_prompt": "Make this LUT more cinematic with cool shadows"
}