Adds GET /api/computers/display-kiosks - the displays that reported in (Kiosk
type), each with its derived FQDN (F<serial>.<domain>). The Dashboard Defaults
form gets a kiosk dropdown that fills the FQDN so admins pick a display instead
of typing an IP; IP stays an optional manual field. Table shows FQDN or IP.
'Business Unit' label -> 'Location' on this page + the settings nav.