feat(server): equipment-tag node writability from Tag.AccessLevel (parity-safe, no migration)

tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/Phase7ApplierHierarchyTests.cs

@@ -143,7 +143,7 @@ public sealed class Phase7ApplierHierarchyTests : IDisposable
         {
             EquipmentTags = new[]
             {
-                new EquipmentTagPlan("tag-1", "eq-1", "drv", FolderPath: "", Name: "Speed", DataType: "Float", FullName: "40001"),
+                new EquipmentTagPlan("tag-1", "eq-1", "drv", FolderPath: "", Name: "Speed", DataType: "Float", FullName: "40001", Writable: false),
             },
         };
 
@@ -264,7 +264,8 @@ public sealed class Phase7ApplierHierarchyTests : IDisposable
         /// <param name="parentFolderNodeId">The node ID of the parent folder, or null for root.</param>
         /// <param name="displayName">The display name of the variable.</param>
         /// <param name="dataType">The OPC UA built-in type name.</param>
-        public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType) { }
+        /// <param name="writable">Whether the node is created read/write.</param>
+        public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType, bool writable) { }
         /// <summary>Rebuilds the address space (stub implementation for testing).</summary>
         public void RebuildAddressSpace() { }
     }