feat(otopcua): applier pass to materialise discovered nodes idempotently

tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/DeferredAddressSpaceSinkTests.cs

@@ -212,6 +212,8 @@ public sealed class DeferredAddressSpaceSinkTests
         }
         /// <inheritdoc />
         public void RebuildAddressSpace() => CallQueue.Enqueue("RB");
+        /// <inheritdoc />
+        public void RaiseNodesAddedModelChange(string affectedNodeId) => CallQueue.Enqueue($"NA:{affectedNodeId}");
     }
 
     private sealed class SurgicalRecordingSink : IOpcUaAddressSpaceSink, ISurgicalAddressSpaceSink
@@ -249,5 +251,7 @@ public sealed class DeferredAddressSpaceSinkTests
         public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType, bool writable, string? historianTagname = null, bool isArray = false, uint? arrayLength = null) { }
         /// <inheritdoc />
         public void RebuildAddressSpace() { }
+        /// <inheritdoc />
+        public void RaiseNodesAddedModelChange(string affectedNodeId) { }
     }
 }