feat(commons): add cluster/admin/diagnostics client interfaces

src/Core/ZB.MOM.WW.OtOpcUa.Commons/Interfaces/IAdminOperationsClient.cs

@@ -0,0 +1,13 @@
+using ZB.MOM.WW.OtOpcUa.Commons.Messages.Admin;
+
+namespace ZB.MOM.WW.OtOpcUa.Commons.Interfaces;
+
+/// <summary>
+/// Cluster-singleton-proxy client for the <c>AdminOperationsActor</c>. The Blazor UI calls
+/// this from any host (admin or driver role); the proxy routes the request to whichever node
+/// holds the admin singleton.
+/// </summary>
+public interface IAdminOperationsClient
+{
+    Task<StartDeploymentResult> StartDeploymentAsync(string createdBy, CancellationToken ct);
+}