refactor(uns): drop dead LoadEquipmentChildrenAsync + LinesForCluster; fix stale comment

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

@@ -103,8 +103,8 @@ public sealed record EquipmentImportResult(int Inserted, int Skipped, IReadOnlyL
 /// <summary>
 /// Loads the structural portion of the unified-namespace (UNS) browse tree —
 /// Enterprise → Cluster → Area → Line → Equipment — from the config database.
-/// Equipment children (tags/virtual tags) are summarised by count only and loaded
-/// lazily by the renderer via <see cref="LoadEquipmentChildrenAsync"/>.
+/// Equipment is a leaf in the tree; its tags and virtual tags are accessed via the
+/// equipment detail page, not via lazy tree expansion.
 /// </summary>
 public interface IUnsTreeService
 {
@@ -117,16 +117,6 @@ public interface IUnsTreeService
     /// <returns>The enterprise root nodes, each populated down to equipment.</returns>
     Task<IReadOnlyList<UnsNode>> LoadStructureAsync(CancellationToken ct = default);
 
-    /// <summary>
-    /// Lazily loads the Tag and VirtualTag leaf nodes for a single equipment node.
-    /// Tags are returned first (ordered by Name), followed by VirtualTags (ordered by Name).
-    /// Leaf nodes carry <c>ChildCount = 0</c> and <c>HasLazyChildren = false</c>.
-    /// </summary>
-    /// <param name="equipmentId">The equipment whose children to load.</param>
-    /// <param name="ct">A token to cancel the load.</param>
-    /// <returns>Tag nodes followed by VirtualTag nodes; empty if the equipment has none.</returns>
-    Task<IReadOnlyList<UnsNode>> LoadEquipmentChildrenAsync(string equipmentId, CancellationToken ct = default);
-
     /// <summary>
     /// Loads the driver tags bound to a single equipment as flat row projections for the equipment
     /// page's Tags tab table, ordered by Name. Each row carries the display columns plus the