chat 根据J-IM提供的示例二次改造。提供了完善的创建群、解散群、邀请人进群、踢人出群、撤回消息、上传文件、系统消息（含为前端提供业务支撑）等解决方案，且应用系统和聊天系统分离，采用MQ维护用户数据.文档说明：https://docs.qq.com/sheet/DRWFoWU51dUloZXhN
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