ollama/ollama#1053 (comment)

Hi folks, ......, we try to keep Ollama focused on serving an http API that can be fronted by a number of proxy servers such as nginx, caddy and more, ...... This allows the maintainer team to focus on core model serving.

I removed the parameters username and password from PullModelRequest for authentication because the project member want to focus on core model serving and leave the authentication service to nginx, caddy, and others. At the same time, I removed the system and options parameters from ShowModelRequest because they are not mentioned in the Ollama doc.