fix(client): alarm filter selected ActiveState/Id as ONE QualifiedName — every event read inactive

EventFilter.AddSelectClause(type, "ActiveState/Id") does not split the string;
it selects a single QualifiedName named "ActiveState/Id", which no event carries.
AckedState/Id, ActiveState/Id and EnabledState/Id therefore always arrived null
and Client.CLI 'alarms' (and Client.UI) reported every alarm inactive and
unacknowledged while a direct Read said Active. Pre-existing since a2883b82;
server-side event delivery was correct (proven with two-element select clauses,
incl. after #629). Select them with explicit two-element browse paths.

Over-the-wire test drives OpcUaClientService.SubscribeAlarmsAsync against the
in-process server (native + scripted); ServerEventRig now also selects
ActiveState/Id, Severity and Retain.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.IntegrationTests/ServerEventRig.cs

@@ -315,6 +315,9 @@ internal sealed class RecordedEvents
     public const int ChangesField = 8;
     public const int SourceNodeField = 9;
     public const int UnshelveTimeField = 10;
+    public const int ActiveField = 11;
+    public const int SeverityField = 12;
+    public const int RetainField = 13;
 
     private readonly object _gate = new();
     private readonly List<(uint Handle, VariantCollection Fields)> _events = [];
@@ -374,6 +377,10 @@ internal sealed class RecordedEvents
         filter.AddSelectClause(ObjectTypes.BaseEventType, BrowseNames.SourceNode);
         filter.SelectClauses.Add(new SimpleAttributeOperand(
             ObjectTypeIds.AlarmConditionType, [BrowseNames.ShelvingState, BrowseNames.UnshelveTime]));
+        filter.SelectClauses.Add(new SimpleAttributeOperand(
+            ObjectTypeIds.AlarmConditionType, [BrowseNames.ActiveState, BrowseNames.Id]));
+        filter.AddSelectClause(ObjectTypes.BaseEventType, BrowseNames.Severity);
+        filter.AddSelectClause(ObjectTypeIds.ConditionType, BrowseNames.Retain);
 
         var item = new MonitoredItem(subscription.DefaultItem)
         {