Add BatchId and AddedWho to DTO; make BatchId nullable

Added BatchId and AddedWho properties to ResultViewDto. Changed BatchId in ResultView from required to nullable to align with DTO and support optional batch IDs.

src/ReC.Application/Common/Dto/ResultViewDto.cs

@@ -30,6 +30,8 @@ public record ResultViewDto
 
     public string? Error { get; set; }
 
+    public string? BatchId { get; set; }
+
     public string? AddedWho { get; init; }
 
     public DateTime? AddedWhen { get; init; }

src/ReC.Domain/Views/ResultView.cs

@@ -55,7 +55,7 @@ public class ResultView
     public string? Error { get; set; }
 
     [Column("BATCH_ID")]
-    public required string BatchId { get; set; }
+    public string? BatchId { get; set; }
 
     [Column("REFERENCE1")]
     public string? Reference1 { get; set; }