List user WebAuthn credentials

curl --request POST \
  --url https://api.fluxer.app/v1/admin/users/list-webauthn-credentials \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_id": "<string>"
}
'

[
  {
    "id": "<string>",
    "name": "<string>",
    "created_at": "<string>",
    "last_used_at": "<string>"
  }
]