feat(pricing): 添加券码管理和使用功能

- 新增券码批次配置和券码实体
- 实现券码创建、领取、使用等接口
- 添加券码状态和优惠类型枚举
- 优化价格计算逻辑，支持券码优惠
- 新增优惠检测和应用相关功能

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

@@ -0,0 +1,23 @@
+package com.ycwl.basic.pricing.service;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.ycwl.basic.pricing.dto.req.VoucherClaimReq;
+import com.ycwl.basic.pricing.dto.req.VoucherCodeQueryReq;
+import com.ycwl.basic.pricing.dto.resp.VoucherCodeResp;
+
+import java.util.List;
+
+public interface VoucherCodeService {
+    
+    void generateVoucherCodes(Long batchId, Long scenicId, Integer count);
+    
+    VoucherCodeResp claimVoucher(VoucherClaimReq req);
+    
+    Page<VoucherCodeResp> queryCodeList(VoucherCodeQueryReq req);
+    
+    List<VoucherCodeResp> getMyVoucherCodes(Long faceId);
+    
+    void markCodeAsUsed(Long codeId, String remark);
+    
+    boolean canClaimVoucher(Long faceId, Long scenicId);
+}