feat(client-cli): add ack/confirm/shelve alarm commands with service layer

Adds ConfirmAlarmAsync and ShelveAlarmAsync to IOpcUaClientService and
OpcUaClientService (mirroring the AcknowledgeAlarmAsync pattern: same
CallMethodAsync/ServiceResultException/StatusCode contract). Adds ShelveKind
enum (OneShot/Timed/Unshelve). Adds three new CLI commands — ack, confirm,
shelve — with hex EventId input and per-command argument validation.
Updates both fakes (CLI + UI) to implement the new interface members and
record calls. Adds 16 unit tests covering argument mapping, invalid-input
CommandException paths, bad-status output, and disconnect-in-finally.

tests/Client/ZB.MOM.WW.OtOpcUa.Client.UI.Tests/Fakes/FakeOpcUaClientService.cs

@@ -263,6 +263,26 @@ public sealed class FakeOpcUaClientService : IOpcUaClientService
         return Task.FromResult(AcknowledgeResult);
     }
 
+    /// <summary>Gets or sets the status code returned by confirmation operations in UI tests.</summary>
+    public StatusCode ConfirmResult { get; set; } = StatusCodes.Good;
+
+    /// <inheritdoc />
+    public Task<StatusCode> ConfirmAlarmAsync(string conditionNodeId, byte[] eventId, string comment,
+        CancellationToken ct = default)
+    {
+        return Task.FromResult(ConfirmResult);
+    }
+
+    /// <summary>Gets or sets the status code returned by shelve operations in UI tests.</summary>
+    public StatusCode ShelveResult { get; set; } = StatusCodes.Good;
+
+    /// <inheritdoc />
+    public Task<StatusCode> ShelveAlarmAsync(string conditionNodeId, ShelveKind kind, double shelvingTimeSeconds = 0,
+        CancellationToken ct = default)
+    {
+        return Task.FromResult(ShelveResult);
+    }
+
     /// <inheritdoc />
     public Task<IReadOnlyList<DataValue>> HistoryReadRawAsync(NodeId nodeId, DateTime startTime, DateTime endTime,
         int maxValues = 1000, CancellationToken ct = default)