feat: support for api_key param

Feature request

Based on what I see in the README:

The API key: The API key used for client authentication. This is optional.

Anyhow, there is no documentation on how to pass an api_key, and if not possible will be a needed feature to secure access to the LLM models.

This question also address the same issue.

Motivation

Hosting LLM in our AWS infra without a protection mechanism is dangerous, and expose security concerns.

Other

No response