Is your feature request related to a problem? Please describe.
Passwords have become a scourge of mankind. Everybody knows they are insecure and user re-use passwords because they can't remember an unique password for each service.

Describe the solution you'd like
User authentication via Passkeys has become super-simple, especially on Github, where Passkeys are detected automagically after pressing the button "Use Passkeys" without having to enter any username or password.
It would be a blessing for users to authenticate at Nginx-Proxy-Manager with Passkeys.

Describe alternatives you've considered
Identity-Provider (e.g. Authentik) -> complicated setup
Authenticating proxy -> two proxies in a row?