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

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeAssemblyTests.cs

@@ -37,7 +37,7 @@ public sealed class UnsTreeAssemblyTests
         var clusters = new[] { new ClusterRow("c1", "zb", "SiteA", "Alpha") };
         var areas = new[] { new AreaRow("a1", "c1", "AreaOne") };
         var lines = new[] { new LineRow("l1", "a1", "LineOne") };
-        var equipment = new[] { new EquipmentRow("e1", "l1", "MC-1", "EquipOne", 0, 0) };
+        var equipment = new[] { new EquipmentRow("e1", "l1", "MC-1", "EquipOne", 0) };
 
         var tree = UnsTreeAssembly.Build(clusters, areas, lines, equipment);
 
@@ -75,8 +75,8 @@ public sealed class UnsTreeAssemblyTests
         var lines = new[] { new LineRow("l1", "a1", "LineOne") };
         var equipment = new[]
         {
-            new EquipmentRow("e1", "l1", "MC-1", "WithChildren", 2, 1),
-            new EquipmentRow("e2", "l1", "MC-2", "Empty", 0, 0),
+            new EquipmentRow("e1", "l1", "MC-1", "WithChildren", 3),
+            new EquipmentRow("e2", "l1", "MC-2", "Empty", 0),
         };
 
         var tree = UnsTreeAssembly.Build(clusters, areas, lines, equipment);
@@ -84,7 +84,7 @@ public sealed class UnsTreeAssemblyTests
 
         // Equipment is a tree leaf that links to its own detail page, so it never carries an
         // expander — HasLazyChildren is always false regardless of its tag/virtual-tag count.
-        // The ChildCount badge still reflects tags + virtual tags.
+        // The ChildCount badge reflects its virtual tags.
         var withChildren = line.Children.Single(e => e.Key == "eq:e1");
         withChildren.ChildCount.ShouldBe(3);
         withChildren.HasLazyChildren.ShouldBeFalse();
@@ -145,8 +145,8 @@ public sealed class UnsTreeAssemblyTests
         };
         var equipment = new[]
         {
-            new EquipmentRow("e2", "l1", "MC-2", "EquipB", 0, 0),
-            new EquipmentRow("e1", "l1", "MC-1", "EquipA", 0, 0),
+            new EquipmentRow("e2", "l1", "MC-2", "EquipB", 0),
+            new EquipmentRow("e1", "l1", "MC-1", "EquipA", 0),
         };
 
         var tree = UnsTreeAssembly.Build(clusters, areas, lines, equipment);

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceEquipmentChildRowsTests.cs

@@ -14,16 +14,8 @@ public sealed class UnsTreeServiceEquipmentChildRowsTests
         return new UnsTreeService(UnsTreeTestDb.Factory(dbName));
     }
 
-    // v3 Batch-1: the equipment↔Tag binding was retired (Tag is Raw-only; authoring moved to the Raw
-    // tree in Batch 2). LoadTagsForEquipmentAsync is a stub that always returns empty — no equipment
-    // has bound driver tags to list. The former in-name-order / EquipmentId-scoping assertions moved
-    // with the authoring surface to the Batch-2 Raw-tree tests.
-    [Fact]
-    public async Task LoadTagsForEquipment_returns_empty_stub()
-    {
-        var rows = await SeededService().LoadTagsForEquipmentAsync(UnsTreeTestDb.SeededEquipmentId);
-        rows.ShouldBeEmpty();
-    }
+    // v3 Batch-1 retired the equipment↔Tag binding; the always-empty LoadTagsForEquipmentAsync stub and
+    // its EquipmentTagRow were deleted (R04 S4). Equipment tags are UnsTagReference rows now.
 
     [Fact]
     public async Task LoadVirtualTagsForEquipment_returns_vtags_in_name_order()
@@ -34,8 +26,4 @@ public sealed class UnsTreeServiceEquipmentChildRowsTests
         rows[0].Name.ShouldBe("computed");
         rows[0].DataType.ShouldBe("Double");
     }
-
-    [Fact]
-    public async Task LoadTagsForEquipment_empty_for_unknown_equipment()
-        => (await SeededService().LoadTagsForEquipmentAsync("EQ-NONE")).ShouldBeEmpty();
 }

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceTagTests.cs

@@ -12,7 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Uns;
 /// <c>FolderPath</c>), the <c>Namespace</c>/<c>NamespaceKind</c> entities were deleted, and tag
 /// authoring moved to the Raw tree (<c>/raw</c>) in Batch 2. So <see cref="UnsTreeService"/>'s
 /// <c>CreateTagAsync</c> / <c>UpdateTagAsync</c> now return a uniform Batch-1 refusal, and
-/// <c>LoadTagsForEquipmentAsync</c> / <c>LoadTagDriversForEquipmentAsync</c> return empty. The tests
+/// <c>LoadTagDriversForEquipmentAsync</c> returns empty. The tests
 /// below assert that stub contract (preserving the intent of the old CRUD-guard / driver-loader
 /// tests) plus the still-live <c>DeleteTagAsync</c> path (which continues to remove a raw Tag row).
 /// </summary>
@@ -153,16 +153,6 @@ public sealed class UnsTreeServiceTagTests
 
     // ----- Per-equipment loaders: retired → empty -----
 
-    /// <summary>The per-equipment tag list is retired (Tag is Raw-only) → always empty.</summary>
-    [Fact]
-    public async Task LoadTagsForEquipment_returns_empty()
-    {
-        var (service, dbName) = Fresh();
-        SeedHierarchy(dbName);
-
-        (await service.LoadTagsForEquipmentAsync("EQ-1")).ShouldBeEmpty();
-    }
-
     /// <summary>The per-equipment candidate-driver loader is retired (equipment↔driver binding gone) → always empty.</summary>
     [Fact]
     public async Task LoadTagDriversForEquipment_returns_empty()