Allow guest access to "protected" routes

I'm trying to just get session information into my handlers. For that I want a route to be accessible by authorised users as well as guests. Can `gin_jwt` library handle this situation? I'm not sure how to avoid the `auth header empty` error.

Start by reading how the gin_jwt middleware protects routes and how handlers receive session information. Reproduce the “auth header empty” case, then clarify the expected behavior for guests versus authorized users and verify that both can reach the route without breaking protected-route authentication.

Written by the indexing model from the issue text.