dashboarddefaults: pick a kiosk from a dropdown (auto-fill FQDN) + Location wording

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.

plugins/computers/api/routes.py

@@ -298,6 +298,42 @@ def _sync_access_methods(comp, data):
 # Computers CRUD
 # =============================================================================
 
+@computers_bp.route('/display-kiosks', methods=['GET'])
+@jwt_required(optional=True)
+def list_display_kiosks():
+    """Reporting display kiosks, for the Dashboard Defaults picker.
+
+    Returns the computers whose type is the one gea-shopfloor-display maps to
+    (default 'Kiosk'), each with its DERIVED FQDN (F<serial>.<domain>, domain
+    from the display_fqdn_domain setting) so an admin picks a kiosk from a
+    dropdown instead of typing an IP/FQDN. Keeps the same F<serial>.<domain>
+    format as core derive_display_fqdn (duplicated to avoid a contract bump).
+    """
+    from ..pctypemap import pctype_mapping
+    from shopdb.api import Setting
+
+    display_type_name = pctype_mapping().get('gea-shopfloor-display', 'Kiosk')
+    ctype = ComputerType.query.filter_by(computertype=display_type_name).first()
+    if not ctype:
+        return success_response([])
+    domain = (Setting.get('display_fqdn_domain', 'device.geaerospace.net')
+              or 'device.geaerospace.net').strip().strip('.')
+    rows = (db.session.query(Computer).join(Asset)
+            .filter(Computer.computertypeid == ctype.computertypeid,
+                    Asset.isactive == True)
+            .order_by(Computer.hostname).all())
+    out = []
+    for comp in rows:
+        serial = (comp.asset.serialnumber or '').strip() if comp.asset else ''
+        out.append({
+            'computerid': comp.computerid,
+            'hostname': comp.hostname,
+            'serialnumber': serial or None,
+            'fqdn': f'F{serial}.{domain}'.lower() if serial else None,
+        })
+    return success_response(out)
+
+
 @computers_bp.route('', methods=['GET'])
 @jwt_required(optional=True)
 def list_computers():