feat(uns): carry created id on UnsMutationResult for equipment create

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

@@ -8,4 +8,6 @@ namespace ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
 /// </summary>
 /// <param name="Ok">Whether the mutation was applied.</param>
 /// <param name="Error">The operator-facing failure message, or <c>null</c> on success.</param>
-public readonly record struct UnsMutationResult(bool Ok, string? Error);
+/// <param name="CreatedId">On a successful create, the new entity's system id (e.g. the generated
+/// <c>EQ-…</c> equipment id) so the caller can navigate to it; <c>null</c> for updates/deletes/failures.</param>
+public readonly record struct UnsMutationResult(bool Ok, string? Error, string? CreatedId = null);

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

@@ -539,7 +539,7 @@ public sealed class UnsTreeService(IDbContextFactory<OtOpcUaConfigDbContext> dbF
             Enabled = input.Enabled,
         });
         await db.SaveChangesAsync(ct);
-        return new UnsMutationResult(true, null);
+        return new UnsMutationResult(true, null, equipmentId);
     }
 
     /// <inheritdoc />

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

@@ -348,6 +348,24 @@ public sealed class UnsTreeServiceEquipmentTests
         verify.Equipment.Single(e => e.EquipmentId == equipmentId).DriverInstanceId.ShouldBe("DRV-1");
     }
 
+    /// <summary>CreateEquipmentAsync returns the generated EQ- id in <c>CreatedId</c> so callers can navigate to the new page.</summary>
+    [Fact]
+    public async Task CreateEquipment_returns_generated_id_in_CreatedId()
+    {
+        var dbName = $"uns-eq-createdid-{Guid.NewGuid():N}";
+        UnsTreeTestDb.SeedNamed(dbName);
+        var service = new UnsTreeService(UnsTreeTestDb.Factory(dbName));
+
+        var input = new EquipmentInput("machine-2", "machine_002", "LINE-1",
+            null, null, null, null, null, null, null, null, null, null, null, null, true);
+
+        var result = await service.CreateEquipmentAsync(input);
+
+        result.Ok.ShouldBeTrue();
+        result.CreatedId.ShouldNotBeNull();
+        result.CreatedId!.ShouldStartWith("EQ-");
+    }
+
     // ----- DeleteEquipment -----
 
     /// <summary>Deleting equipment removes the row.</summary>