app端：开始上课中，新增预约接口

lisy

2023-08-04 c70c9ecf1bee12e85778dc268308c872b95e477f

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package com.dsh.course.service;
 
import com.baomidou.mybatisplus.extension.service.IService;
import com.dsh.course.entity.City;
import com.dsh.guns.modular.system.model.TCity;
 
public interface ICityService extends IService<TCity> {
}