How do you configure this to only use Ollama?

### What is your question?

It's unclear to me how to use Ollama with this.

Any time I try to configure an Ollama provider, it will never connect to my instance (I've confirmed my Ollama instance is accessible by my other services).

Is there any documentation about configuring trae-agent with _only_ Ollama?

### Additional information that you believe is relevant to this question

_No response_

Begin by locating trae-agent's Ollama provider configuration entry point and any existing setup documentation, then verify the configuration against an accessible Ollama instance. Document the steps and required settings for using only Ollama; done when a user can follow them to connect successfully.

Written by the indexing model from the issue text.