Account Passkey based authentication

[Vermunds]

I'd like to suggest adding support for passkey-based login (FIDO2/WebAuthn). It's way more secure than passwords and works great with password managers like 1Password or Bitwarden.

Passkeys are easier to use, work across devices, and don’t rely on typing in passwords or dealing with 2FA codes every time. A lot of major platforms are moving in this direction, and it’d be great to see Nexus Mods do the same.

Here is a link with some additional, more detailed information:
https://fidoalliance.org/passkeys/

Thanks.