feat(GWC-37,WRK-32): refresh live alarm watch lists

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/IAlarmCommandHandler.cs

@@ -7,7 +7,8 @@ namespace ZB.MOM.WW.MxGateway.Worker.MxAccess;
 /// <summary>
 ///     Per-session interface routing the worker's alarm IPC commands —
 ///     <c>SubscribeAlarmsCommand</c>, <c>AcknowledgeAlarmCommand</c>,
-///     <c>QueryActiveAlarmsCommand</c>, <c>UnsubscribeAlarmsCommand</c> —
+///     <c>UpdateAlarmWatchListCommand</c>, <c>QueryActiveAlarmsCommand</c>,
+///     <c>UnsubscribeAlarmsCommand</c> —
 ///     to the underlying <see cref="AlarmDispatcher"/>. Production binding
 ///     is <see cref="AlarmCommandHandler"/>; tests substitute a fake.
 /// </summary>
@@ -24,6 +25,13 @@ public interface IAlarmCommandHandler : IDisposable
     /// <param name="sessionId">The session identifier.</param>
     void Subscribe(SubscribeAlarmsCommand command, string sessionId);
 
+    /// <summary>
+    ///     Replace the active auto-failover subscription's subtag standby
+    ///     targets without restarting its primary provider.
+    /// </summary>
+    /// <param name="watchList">The complete replacement watch list.</param>
+    void UpdateWatchList(IReadOnlyList<AlarmSubtagTarget> watchList);
+
     /// <summary>Tear down the active subscription. No-op if not subscribed.</summary>
     void Unsubscribe();