fix(client): TimedShelve milliseconds + shelve node guard + service-layer tests

Important 1: ShelveAlarmAsync Timed branch now multiplies shelvingTimeSeconds × 1000.0
before passing to CallMethodAsync — OPC UA Part 9 TimedShelve ShelvingTime is a Duration
in milliseconds, not seconds. IOpcUaClientService XML doc and ShelveCommand --duration
description updated to document the seconds-in / ms-out contract.

Important 2: ShelveAlarmAsync builds shelvingStateNodeId with the same
EndsWith(".ShelvingState") guard already used by the .Condition suffix in
AcknowledgeAlarmAsync / ConfirmAlarmAsync, preventing double-append.

Important 3: Add 6 service-layer tests to OpcUaClientServiceTests —
  ConfirmAlarmAsync_OnSuccess_ReturnsGood
  ConfirmAlarmAsync_OnServiceResultException_ReturnsBadStatusCode
  ShelveAlarmAsync_OneShot_CallsMethodWithNoArgs
  ShelveAlarmAsync_Timed_PassesDurationInMilliseconds (regression guard for Important 1)
  ShelveAlarmAsync_Unshelve_CallsMethodWithNoArgs
  ShelveAlarmAsync_OnServiceResultException_ReturnsBadStatusCode
FakeSessionAdapter extended with CallMethodInputArgs list to record per-call input
arguments so the Timed test can assert the ms value.

Minor 4: ShelveCommand output changed from "Shelve (OneShot) successful" to
"{shelveKind} successful/failed" so Unshelve reads "Unshelve successful: …".

Minor 6: ShelveCommand --duration description updated to "(must be > 0; in seconds,
converted to milliseconds for the OPC UA call; required for --kind Timed)".

src/Client/ZB.MOM.WW.OtOpcUa.Client.Shared/OpcUaClientService.cs

@@ -417,7 +417,9 @@ public sealed class OpcUaClientService : IOpcUaClientService
 
         // The shelve methods live on the ShelvingState child of the condition node.
         // conditionNodeId is the alarm/condition node; append .ShelvingState to get the state machine node.
-        var shelvingStateNodeId = NodeId.Parse(conditionNodeId + ".ShelvingState");
+        var shelvingStateNodeId = conditionNodeId.EndsWith(".ShelvingState")
+            ? NodeId.Parse(conditionNodeId)
+            : NodeId.Parse(conditionNodeId + ".ShelvingState");
 
         NodeId methodId;
         object[] inputArgs;
@@ -433,7 +435,8 @@ public sealed class OpcUaClientService : IOpcUaClientService
                     throw new ArgumentOutOfRangeException(nameof(shelvingTimeSeconds),
                         "Timed shelving requires a positive shelvingTimeSeconds value.");
                 methodId = MethodIds.AlarmConditionType_ShelvingState_TimedShelve;
-                inputArgs = [shelvingTimeSeconds];
+                // OPC UA Part 9 TimedShelve ShelvingTime input is a Duration (Double) in milliseconds.
+                inputArgs = [shelvingTimeSeconds * 1000.0];
                 break;
             case ShelveKind.Unshelve:
                 methodId = MethodIds.AlarmConditionType_ShelvingState_Unshelve;