refactor(mall): 调整退款金额计算逻辑

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2025-05-20 889e5f608dfc153808199e0df9b02d0a41faae11

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="${basePackage}.${mapperPackage}.${className}Mapper">
 
</mapper>