Which sign-in methods this instance has configured

Public, unauthenticated. Email/password reports sign-in and sign-up separately because hosted Postbag keeps password sign-in for existing users while disabling new password registration. social lists only the OAuth providers this instance has both a client id and secret for (self-host parity: a self-hosted instance with neither configured returns an empty list). The dashboard calls this once, cached, to decide which social sign-in buttons to render.