fix(coupon): 优化事务回滚标记逻辑

- 添加对无事务上下文情况的处理
- 避免在非事务环境下抛出异常
- 提高优惠券领取失败时的系统稳定性

src/main/java/com/ycwl/basic/pricing/service/impl/CouponServiceImpl.java

@@ -17,6 +17,7 @@ import lombok.RequiredArgsConstructor;
 import java.util.Date;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.NoTransactionException;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.transaction.interceptor.TransactionAspectSupport;
 
@@ -292,7 +293,7 @@ public class CouponServiceImpl implements ICouponService {
             return CouponClaimResult.success(claimRecord, coupon);
             
         } catch (CouponInvalidException e) {
-            TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
+            markRollbackOnly();
             log.warn("领取优惠券失败(业务校验不通过): userId={}, couponId={}, reason={}",
                     request.getUserId(), request.getCouponId(), e.getMessage());
             String errorCode = e.getErrorCode() == null
@@ -300,10 +301,18 @@ public class CouponServiceImpl implements ICouponService {
                     : e.getErrorCode();
             return CouponClaimResult.failure(errorCode, e.getMessage());
         } catch (Exception e) {
-            TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
+            markRollbackOnly();
             log.error("领取优惠券失败: userId={}, couponId={}",
                     request.getUserId(), request.getCouponId(), e);
             return CouponClaimResult.failure(CouponClaimResult.ERROR_SYSTEM_ERROR, "系统错误，领取失败：" + e.getMessage());
         }
     }
+
+    private void markRollbackOnly() {
+        try {
+            TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
+        } catch (NoTransactionException ex) {
+            log.debug("未检测到Spring事务上下文，跳过回滚标记");
+        }
+    }
 }