feat(config): make Equipment.DriverInstanceId nullable + driver-less AdminUI support + migration

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/Entities/Equipment.cs

@@ -19,8 +19,11 @@ public sealed class Equipment
     /// <summary>UUIDv4, IMMUTABLE across all generations of the same EquipmentId. Downstream-consumer join key.</summary>
     public Guid EquipmentUuid { get; set; }
 
-    /// <summary>Logical FK to the driver providing data for this equipment.</summary>
-    public required string DriverInstanceId { get; set; }
+    /// <summary>
+    ///     Optional logical FK to the driver providing data for this equipment.
+    ///     <c>null</c> = VirtualTag-only / driver-less equipment (no field driver).
+    /// </summary>
+    public string? DriverInstanceId { get; set; }
 
     /// <summary>Optional logical FK to a multi-device driver's device.</summary>
     public string? DeviceId { get; set; }

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

@@ -0,0 +1,40 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ZB.MOM.WW.OtOpcUa.Configuration.Migrations
+{
+    /// <inheritdoc />
+    public partial class NullableEquipmentDriverInstanceId : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<string>(
+                name: "DriverInstanceId",
+                table: "Equipment",
+                type: "nvarchar(64)",
+                maxLength: 64,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(64)",
+                oldMaxLength: 64);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<string>(
+                name: "DriverInstanceId",
+                table: "Equipment",
+                type: "nvarchar(64)",
+                maxLength: 64,
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "nvarchar(64)",
+                oldMaxLength: 64,
+                oldNullable: true);
+        }
+    }
+}

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/Migrations/OtOpcUaConfigDbContextModelSnapshot.cs

@@ -546,7 +546,6 @@ namespace ZB.MOM.WW.OtOpcUa.Configuration.Migrations
                         .HasColumnType("nvarchar(512)");
 
                     b.Property<string>("DriverInstanceId")
-                        .IsRequired()
                         .HasMaxLength(64)
                         .HasColumnType("nvarchar(64)");