feat(convert): 添加创建时间字段映射

- 在BizSoftwareCopyrightConvert转换器中添加createdTime字段映射
- 确保实体的创建时间能够正确传递到DTO对象

src/main/java/cn/com/poc/ai_software_copyright/convert/BizSoftwareCopyrightConvert.java

@@ -101,6 +101,7 @@ public class BizSoftwareCopyrightConvert {
         );
         softwareCopyRightDto.setGeneratedStatus(entity.getGeneratedStatus());
         softwareCopyRightDto.setErrorMess(entity.getErrorMess());
+        softwareCopyRightDto.setCreatedTime(entity.getCreatedTime());
         return softwareCopyRightDto;
     }