整理字段长度，迁移准备工作完毕

IRaCIS.Core.Domain/Reading/ReadingFormAnswer/ReadingTableQuestionAnswer.cs

@@ -31,6 +31,7 @@ public class ReadingTableQuestionAnswer : BaseFullDeleteAuditEntity
     public Guid TrialId { get; set; }
     public decimal RowIndex { get; set; }
 
+    [StringLength(1000)]
     public string Answer { get; set; } = string.Empty;
     public Guid RowId { get; set; }
 }