fix(#752): add DTO fields and null-defaults for isCharged/isRefunded/isExecuted

- ExamApplyDto: add missing Integer fields (isCharged, isRefunded, isExecuted)
  to match entity, enabling proper deserialization from frontend
- ExamApplyController: default null values to 0 for defensive programming

healthlink-his-server/healthlink-his-application/src/main/java/com/healthlink/his/web/check/controller/ExamApplyController.java

@@ -169,6 +169,9 @@ public class ExamApplyController extends BaseController {
         examApply.setApplyTime(LocalDateTime.now());
         examApply.setCreateTime(new Date());
         examApply.setApplyStatus(0); // 0=已开单
+        if (examApply.getIsCharged() == null) examApply.setIsCharged(0);
+        if (examApply.getIsRefunded() == null) examApply.setIsRefunded(0);
+        if (examApply.getIsExecuted() == null) examApply.setIsExecuted(0);
 
         // 操作员工号取当前登录用户
         try {

healthlink-his-server/healthlink-his-application/src/main/java/com/healthlink/his/web/check/dto/ExamApplyDto.java

@@ -84,6 +84,15 @@ public class ExamApplyDto implements Serializable {
     /** 申请单状态 0已开单 1已收费 2已预约 3已签到 4部分报告 5已完告 6作废 */
     private Integer applyStatus;
 
+    /** 是否已收费 0=否 1=是 */
+    private Integer isCharged;
+
+    /** 是否已退费 0=否 1=是 */
+    private Integer isRefunded;
+
+    /** 是否已执行 0=否 1=是 */
+    private Integer isExecuted;
+
     /** 就诊ID（用于写入门诊医嘱和费用项关联） */
     private Long encounterId;