Add more security layers to standalone client

It's 2025, even some of my internet store accounts has 2nd verification when logging in. Please add an option to add sms or email verification when using standalone client.

Honestly, I just want 2FA support for apps such as Ente Auth or Google Authenticator.

SMS-based 2FA is wildly insecure, and I don't believe the level of protection added would justify the development costs. Email-based 2FA is somewhat similarly unimpressive; and, indeed, I believe they already have some system enabled by default which leverages this technology.