refactor(adminui): delete the dead LoadTagsForEquipmentAsync surface (R04 S4)

v3 retired the equipment-Tag binding; IUnsTreeService.LoadTagsForEquipmentAsync
always returned empty, had no production caller, and EquipmentTagRow plus the
always-zero tagCounts / EquipmentRow.TagCount plumbing existed only to feed it.
All removed; the equipment badge count (virtual tags) is unchanged.

Refs #745
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

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

@@ -2,11 +2,6 @@ using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
 
 namespace ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
 
-/// <summary>A tag row for the equipment page's Tags tab table — display columns plus the id used to
-/// open the edit modal. RowVersion is re-read fresh on delete (matching the tree's delete path).</summary>
-public sealed record EquipmentTagRow(
-    string TagId, string Name, string DriverInstanceId, string DataType, TagAccessLevel AccessLevel);
-
 /// <summary>A virtual-tag row for the equipment page's Virtual Tags tab table.</summary>
 public sealed record EquipmentVirtualTagRow(string VirtualTagId, string Name, string DataType, string ScriptId, bool Enabled);
 

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

@@ -117,17 +117,6 @@ public interface IUnsTreeService
     /// <returns>The enterprise root nodes, each populated down to equipment.</returns>
     Task<IReadOnlyList<UnsNode>> LoadStructureAsync(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
-    /// <c>TagId</c> the table uses to open the edit modal. Reads untracked. Returns an empty list when
-    /// the equipment has no tags.
-    /// </summary>
-    /// <param name="equipmentId">The equipment whose tags to load.</param>
-    /// <param name="ct">A token to cancel the load.</param>
-    /// <returns>The equipment's tag rows ordered by Name; empty if it has none.</returns>
-    Task<IReadOnlyList<EquipmentTagRow>> LoadTagsForEquipmentAsync(string equipmentId, CancellationToken ct = default);
-
     /// <summary>
     /// Loads the virtual tags scoped to a single equipment as flat row projections for the equipment
     /// page's Virtual Tags tab table, ordered by Name. Each row carries the display columns plus the

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

@@ -75,13 +75,13 @@ public readonly record struct AreaRow(string UnsAreaId, string ClusterId, string
 /// <summary>Flat structural row describing a UNS line and its owning area.</summary>
 public readonly record struct LineRow(string UnsLineId, string UnsAreaId, string Name);
 
-/// <summary>Flat structural row describing an equipment node, its owning line and its tag/virtual-tag counts.</summary>
+/// <summary>Flat structural row describing an equipment node, its owning line and its virtual-tag count.
+/// (The driver-tag count was retired with the v3 equipment↔Tag binding; it was always zero.)</summary>
 public readonly record struct EquipmentRow(
     string EquipmentId,
     string UnsLineId,
     string MachineCode,
     string Name,
-    int TagCount,
     int VirtualTagCount);
 
 /// <summary>
@@ -237,7 +237,7 @@ public static class UnsTreeAssembly
 
     private static UnsNode BuildEquipment(EquipmentRow equipment, string clusterId)
     {
-        var childCount = equipment.TagCount + equipment.VirtualTagCount;
+        var childCount = equipment.VirtualTagCount;
         return new UnsNode
         {
             Kind = UnsNodeKind.Equipment,

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

@@ -61,11 +61,6 @@ public sealed class UnsTreeService(
             })
             .ToListAsync(ct);
 
-        // Per-equipment driver-tag counts: the equipment↔Tag binding was retired in v3
-        // (Tag is now Raw-only; authoring moved to the Raw tree in Batch 2/3). No binding
-        // exists to count against, so every equipment reports zero driver tags.
-        var tagCounts = new Dictionary<string, int>(StringComparer.Ordinal);
-
         // Per-equipment virtual-tag counts (virtual tags with no equipment are excluded).
         var vtagCounts = (await db.VirtualTags
                 .AsNoTracking()
@@ -81,21 +76,12 @@ public sealed class UnsTreeService(
                 e.UnsLineId,
                 e.MachineCode,
                 e.Name,
-                tagCounts.GetValueOrDefault(e.EquipmentId),
                 vtagCounts.GetValueOrDefault(e.EquipmentId)))
             .ToList();
 
         return UnsTreeAssembly.Build(clusters, areas, lines, equipment);
     }
 
-    /// <inheritdoc />
-    public Task<IReadOnlyList<EquipmentTagRow>> LoadTagsForEquipmentAsync(string equipmentId, CancellationToken ct = default)
-    {
-        // The equipment↔Tag binding was retired in v3 (Tag is now Raw-only; authoring moved to
-        // the Raw tree in Batch 2/3). No equipment-bound tags exist to list.
-        return Task.FromResult<IReadOnlyList<EquipmentTagRow>>(Array.Empty<EquipmentTagRow>());
-    }
-
     /// <inheritdoc />
     public async Task<IReadOnlyList<EquipmentVirtualTagRow>> LoadVirtualTagsForEquipmentAsync(string equipmentId, CancellationToken ct = default)
     {