feat(pricing): 添加一口价购买功能

- 新增 OnePricePurchaseController 控制器
- 新增 OnePriceConfigFilterRequest、OnePriceConfigRequest、OnePriceInfo等 DTO 类
- 新增 PriceOnePriceConfig 实体类和对应的 Mapper 接口
- 实现 OnePricePurchaseDiscountProvider 优惠提供者
- 实现 OnePricePurchaseServiceImpl 服务实现类
-定义 IOnePricePurchaseService服务接口
- 优化 DiscountDetail 类，添加创建一口价折扣的方法
- 修改 CLAUDE.md，将 error 方法改为 fail 方法

src/main/java/com/ycwl/basic/pricing/mapper/PriceOnePriceConfigMapper.java

@@ -0,0 +1,93 @@
+package com.ycwl.basic.pricing.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.ycwl.basic.pricing.entity.PriceOnePriceConfig;
+import org.apache.ibatis.annotations.*;
+
+import java.util.List;
+
+/**
+ * 一口价配置Mapper
+ */
+@Mapper
+public interface PriceOnePriceConfigMapper extends BaseMapper<PriceOnePriceConfig> {
+    
+    /**
+     * 查询启用的一口价配置
+     */
+    @Select("SELECT * FROM price_one_price_config WHERE is_active = 1 AND deleted = 0 " +
+            "ORDER BY scenic_id")
+    List<PriceOnePriceConfig> selectActiveConfigs();
+    
+    /**
+     * 根据景区ID查询启用的配置
+     */
+    @Select("SELECT * FROM price_one_price_config " +
+            "WHERE is_active = 1 AND deleted = 0 " +
+            "AND scenic_id = #{scenicId} " +
+            "LIMIT 1")
+    PriceOnePriceConfig selectConfigByScenic(@Param("scenicId") Long scenicId);
+    
+    /**
+     * 查询特定景区的所有配置
+     */
+    @Select("SELECT * FROM price_one_price_config " +
+            "WHERE is_active = 1 AND deleted = 0 " +
+            "AND scenic_id = #{scenicId}")
+    List<PriceOnePriceConfig> selectConfigsByScenic(@Param("scenicId") Long scenicId);
+    
+    /**
+     * 根据ID查询启用的配置
+     */
+    @Select("SELECT * FROM price_one_price_config " +
+            "WHERE id = #{id} AND is_active = 1 AND deleted = 0")
+    PriceOnePriceConfig selectActiveConfigById(Long id);
+    
+    /**
+     * 查询所有配置（包含禁用的）- 管理端使用
+     */
+    @Select("SELECT * FROM price_one_price_config WHERE deleted = 0 " +
+            "ORDER BY is_active DESC, create_time DESC")
+    List<PriceOnePriceConfig> selectAllConfigsForAdmin();
+    
+    /**
+     * 插入配置
+     */
+    @Insert("INSERT INTO price_one_price_config " +
+            "(config_name, scenic_id, one_price, original_price, description, is_active, " +
+            "start_time, end_time, can_use_coupon, can_use_voucher, " +
+            "create_time, update_time, create_by, deleted) " +
+            "VALUES " +
+            "(#{configName}, #{scenicId}, #{onePrice}, #{originalPrice}, #{description}, #{isActive}, " +
+            "#{startTime}, #{endTime}, #{canUseCoupon}, #{canUseVoucher}, " +
+            "NOW(), NOW(), #{createBy}, 0)")
+    @Options(useGeneratedKeys = true, keyProperty = "id")
+    int insertConfig(PriceOnePriceConfig config);
+    
+    /**
+     * 更新配置
+     */
+    @Update("UPDATE price_one_price_config SET " +
+            "config_name = #{configName}, scenic_id = #{scenicId}, " +
+            "one_price = #{onePrice}, original_price = #{originalPrice}, " +
+            "description = #{description}, is_active = #{isActive}, " +
+            "start_time = #{startTime}, end_time = #{endTime}, " +
+            "can_use_coupon = #{canUseCoupon}, can_use_voucher = #{canUseVoucher}, " +
+            "update_time = NOW(), update_by = #{updateBy} " +
+            "WHERE id = #{id} AND deleted = 0")
+    int updateConfig(PriceOnePriceConfig config);
+    
+    /**
+     * 更新配置状态
+     */
+    @Update("UPDATE price_one_price_config SET is_active = #{isActive}, update_time = NOW() " +
+            "WHERE id = #{id} AND deleted = 0")
+    int updateConfigStatus(@Param("id") Long id, @Param("isActive") Boolean isActive);
+    
+    /**
+     * 逻辑删除配置
+     */
+    @Update("UPDATE price_one_price_config SET deleted = 1, deleted_at = NOW() " +
+            "WHERE id = #{id}")
+    int deleteConfig(Long id);
+}