[FEATURE] Pass JWT in Authorization header

Is your feature request related to a problem? Please describe.

I have applications that do their own auth based on JWT that I would like to use tinyauth to get the JWT from the IDP and send to the backend application.

Describe the solution you'd like.

A optional config flag that when enabled passes the JWT from the IDP inside the Authorization HTTP header along to the backend application.

Like what oauth2-proxy does.

Describe alternatives you've considered.

No response

Additional context

No response

Human Written Confirmation

• I confirm this request was written by me and not generated by an LLM or AI assistant.