Feature/auth o tron

[sametd]

This PR refactors the authentication logic in the aviso_auth service and updates the CLI integration.
The main goals are to:

• Simplify the token validation flow
• Integrate caching for token validation using Flask-Caching so that repeated validations for the same token are served from cache (reducing load on auth‑o‑tron).
• Improve error handling and logging so that dynamic WWW‑Authenticate headers from auth‑o‑tron are propagated and 401 errors are clearly reported with client IP and auth type details.
• Adjust CLI parts to work with the new authentication flow while preserving backward compatibility.