feat(pricing): 新增升单检测功能

- 添加升单检测接口和相关 DTO 类
- 实现升单检测逻辑，包括价格汇总、一口价评估和打包优惠评估
- 优化商品列表复制和规范化处理
- 新增 IBundleDiscountService 依赖

src/main/java/com/ycwl/basic/pricing/controller/PriceCalculationController.java

@@ -59,6 +59,20 @@ public class PriceCalculationController {
         return null;
     }
     
+    /**
+     * 升单检测：判断是否命中一口价或打包优惠
+     */
+    @PostMapping("/upgrade-check")
+    public ApiResponse<UpgradeCheckResult> upgradeCheck(@RequestBody UpgradeCheckRequest request) {
+        log.info("升单检测请求: scenicId={}, purchased={}, intending={}",
+                request.getScenicId(),
+                request.getPurchasedProducts() != null ? request.getPurchasedProducts().size() : 0,
+                request.getIntendingProducts() != null ? request.getIntendingProducts().size() : 0);
+        
+        UpgradeCheckResult result = priceCalculationService.checkUpgrade(request);
+        return ApiResponse.success(result);
+    }
+    
     /**
      * 查询用户可用优惠券
      */