Adding passkey support

[panda2134]

Is your feature request related to a problem? Please describe.
Currently, if the user enables 2FA then a TOTP is required at every login. Given that some users do have access to devices that are more secure than an app-based 2FA code (e.g., security tokens like Google Titan or Yubikey), it would be great if PiKVM supports a passwordless login with those devices using a passkey.

Describe the solution you'd like
Implement the passkey protocol and allow passwordless login with security tokens.

Describe alternatives you've considered
Do not implement the passkey protocol, but allow using WebAuthn / Yubikey as an alternative second factor. That is, after providing the password, instead of typing in the 6-digit code at every login, the user interacts with a security token to prove their identity.

Additional context
Try passkey at https://passkey.org. I'm personally interested in submitting a pull request on this if I have time.

[mdevaev]

Hello. I think it can be done, but most likely we will need a new plugin api for authorization inside KVMD.