fix: 修正 sourceOrderNo 属性访问路径

backend/services/reward-service/src/application/services/reward-application.service.ts

@@ -457,7 +457,7 @@ export class RewardApplicationService {
       hashpowerAmount: r.hashpowerAmount.value,
       createdAt: r.createdAt,
       claimedAt: r.claimedAt,
-      sourceOrderNo: r.sourceOrderNo,
+      sourceOrderNo: r.rewardSource.sourceOrderNo,
       memo: r.memo,
     }));
   }