fix(adminui): show + clarify driver-less equipment across list/import (Task 1 review)

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/Migrations/20260608104706_NullableEquipmentDriverInstanceId.cs

@@ -24,6 +24,8 @@ namespace ZB.MOM.WW.OtOpcUa.Configuration.Migrations
         /// <inheritdoc />
         protected override void Down(MigrationBuilder migrationBuilder)
         {
+            // WARNING: this rollback converts any existing NULL (driver-less) rows to "" for DriverInstanceId.
+            // Only safe when no driver-less equipment exists in the database.
             migrationBuilder.AlterColumn<string>(
                 name: "DriverInstanceId",
                 table: "Equipment",

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Clusters/ClusterEquipment.razor

@@ -83,8 +83,15 @@ else
         await using var db = await DbFactory.CreateDbContextAsync();
         var driversInCluster = db.DriverInstances.AsNoTracking()
             .Where(d => d.ClusterId == ClusterId).Select(d => d.DriverInstanceId);
+        // Driver-less equipment (DriverInstanceId == null) has no DriverInstance FK.
+        // Scope it to this cluster via UnsLine → UnsArea.ClusterId instead.
+        var areaIds = db.UnsAreas.AsNoTracking()
+            .Where(a => a.ClusterId == ClusterId).Select(a => a.UnsAreaId);
+        var linesInCluster = db.UnsLines.AsNoTracking()
+            .Where(l => areaIds.Contains(l.UnsAreaId)).Select(l => l.UnsLineId);
         _rows = await db.Equipment.AsNoTracking()
-            .Where(e => driversInCluster.Contains(e.DriverInstanceId))
+            .Where(e => driversInCluster.Contains(e.DriverInstanceId)
+                     || (e.DriverInstanceId == null && linesInCluster.Contains(e.UnsLineId)))
             .OrderBy(e => e.Name)
             .ToListAsync();
     }

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Clusters/ImportEquipment.razor

@@ -108,6 +108,9 @@
     private bool _busy;
     private string? _error;
 
+    // Bulk import requires a DriverInstanceId by design — every CSV row must reference an existing driver.
+    // Driver-less equipment (DriverInstanceId == null) is not supported via bulk import;
+    // create it via the single-add editor (/clusters/{id}/equipment/new) or the SQL loader.
     private static readonly string[] RequiredColumns = ["Name", "MachineCode", "UnsLineId", "DriverInstanceId"];
     private static readonly string[] OptionalColumns = ["ZTag", "SAPID", "Manufacturer", "Model"];