feat(mall): 添加活动报名人数减少逻辑

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2025-04-27 ed5a6de6023e73e7f5b5af86a94aa4f1e43a3fc4

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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>