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/VoucherBatchService.java

@@ -0,0 +1,27 @@
+package com.ycwl.basic.pricing.service;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.ycwl.basic.pricing.dto.req.VoucherBatchCreateReq;
+import com.ycwl.basic.pricing.dto.req.VoucherBatchQueryReq;
+import com.ycwl.basic.pricing.dto.resp.VoucherBatchResp;
+import com.ycwl.basic.pricing.dto.resp.VoucherBatchStatsResp;
+import com.ycwl.basic.pricing.entity.PriceVoucherBatchConfig;
+
+public interface VoucherBatchService {
+    
+    Long createBatch(VoucherBatchCreateReq req);
+    
+    Page<VoucherBatchResp> queryBatchList(VoucherBatchQueryReq req);
+    
+    VoucherBatchResp getBatchDetail(Long id);
+    
+    VoucherBatchStatsResp getBatchStats(Long id);
+    
+    void updateBatchStatus(Long id, Integer status);
+    
+    void updateBatchClaimedCount(Long batchId);
+    
+    void updateBatchUsedCount(Long batchId);
+    
+    PriceVoucherBatchConfig getAvailableBatch(Long scenicId, Long brokerId);
+}