价格查询，待处理订单内容

src/main/java/com/ycwl/basic/pricing/service/IPriceCalculationService.java

@@ -0,0 +1,18 @@
+package com.ycwl.basic.pricing.service;
+
+import com.ycwl.basic.pricing.dto.PriceCalculationRequest;
+import com.ycwl.basic.pricing.dto.PriceCalculationResult;
+
+/**
+ * 价格计算服务接口
+ */
+public interface IPriceCalculationService {
+    
+    /**
+     * 计算商品价格（支持自动优惠券应用）
+     * 
+     * @param request 价格计算请求
+     * @return 价格计算结果
+     */
+    PriceCalculationResult calculatePrice(PriceCalculationRequest request);
+}