feat(sms): NotificationListForm adapter-gated Type selector + per-type recipients (S7)

src/ZB.MOM.WW.ScadaBridge.CentralUI/Services/INotificationChannelCatalog.cs

@@ -0,0 +1,21 @@
+using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
+
+namespace ZB.MOM.WW.ScadaBridge.CentralUI.Services;
+
+/// <summary>
+/// Exposes the set of notification delivery channels that actually have a registered
+/// delivery adapter, so the Central UI never offers a notification-list Type that the
+/// central node cannot deliver. The list is derived from the registered
+/// <see cref="ZB.MOM.WW.ScadaBridge.NotificationOutbox.Delivery.INotificationDeliveryAdapter"/>
+/// set (each adapter handles a single <see cref="NotificationType"/>) rather than from
+/// the <see cref="NotificationType"/> enum, so adding/removing an adapter changes the UI
+/// options automatically.
+/// </summary>
+public interface INotificationChannelCatalog
+{
+    /// <summary>
+    /// The distinct notification channels that have a registered delivery adapter,
+    /// in a stable order. Never empty in a correctly configured central node.
+    /// </summary>
+    IReadOnlyList<NotificationType> SupportedChannels { get; }
+}