feat(adminui): UNS-tree delete for Cluster + Enterprise (refuse-if-children, no rowversion)

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/IUnsTreeService.cs

@@ -332,6 +332,32 @@ public interface IUnsTreeService
     /// <returns>Success, a concurrency failure, or a delete-failed failure.</returns>
     Task<UnsMutationResult> DeleteEquipmentAsync(string equipmentId, byte[] rowVersion, CancellationToken ct = default);
 
+    /// <summary>
+    /// Deletes a server cluster. A missing row is treated as success (already gone). The delete is
+    /// refuse-if-children: a cluster that still owns nodes, namespaces, UNS areas, or driver
+    /// instances is left intact and a guidance message is returned (the same convention as
+    /// Area/Line/Equipment, and matching the existing cluster-settings "Delete cluster" behaviour).
+    /// The <see cref="Configuration.Entities.ServerCluster"/> entity carries no concurrency token,
+    /// so — unlike the Area/Line/Equipment deletes — this signature takes no <c>rowVersion</c>.
+    /// </summary>
+    /// <param name="clusterId">The cluster to delete.</param>
+    /// <param name="ct">A token to cancel the operation.</param>
+    /// <returns>Success, or a refuse-if-children failure naming what still references the cluster.</returns>
+    Task<UnsMutationResult> DeleteClusterAsync(string clusterId, CancellationToken ct = default);
+
+    /// <summary>
+    /// Deletes every cluster carrying the given <c>Enterprise</c> label. The enterprise is a tree
+    /// label (a string value on cluster rows), not a DB entity, so deleting it means deleting all of
+    /// its clusters. The operation is all-or-nothing: it first checks every matching cluster for
+    /// children; if <em>any</em> cluster still owns nodes, namespaces, UNS areas, or driver instances
+    /// the whole delete refuses (naming the first blocking cluster) and nothing is removed — there is
+    /// never a partial enterprise deletion. An enterprise with no matching clusters is a no-op success.
+    /// </summary>
+    /// <param name="enterpriseName">The <c>Enterprise</c> label whose clusters to delete.</param>
+    /// <param name="ct">A token to cancel the operation.</param>
+    /// <returns>Success, or a refuse-if-children failure naming the blocking cluster.</returns>
+    Task<UnsMutationResult> DeleteEnterpriseAsync(string enterpriseName, CancellationToken ct = default);
+
     /// <summary>
     /// Loads the drivers eligible to back a tag on the given equipment: drivers in the equipment's
     /// cluster (<c>Equipment.UnsLine → UnsArea.ClusterId</c>) whose namespace is Equipment-kind