Login with WebAuthn MFA

curl --request POST \
  --url https://api.fluxer.app/v1/auth/login/mfa/webauthn \
  --header 'Content-Type: application/json' \
  --data '
{
  "response": {},
  "challenge": "<string>",
  "ticket": "<string>"
}
'

{
  "token": "<string>",
  "user_id": "<string>"
}