pub fn validate_verification_uri(uri: &str) -> Result<(), MuseAuthError>Expand description
Verification destinations must be plain HTTPS pages on a Meta-owned host
(meta.com / *.meta.com, meta.ai / *.meta.ai). Rejects userinfo,
explicit ports, fragments, and look-alike hosts. Path/query are left to
the server (the device page shape is not part of the pinned contract).