fix: 系统提示词非必填

ageerle

2025-04-22 620ea1fc764621b21289c41c56a24a88cfeb7857

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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="org.ruoyi.mapper.ChatModelMapper">
 
</mapper>