feat：完善项目

app/controller/user/instance.go

@@ -254,6 +254,15 @@ func (c *Instance) Form(params *InstanceParams) error {
 func (c *Instance) Delete(id uint64) error {
 	mSysUser := model.NewSysUser()
 	mSysUser.ID = id
+	isExist, err := model2.FirstField(mSysUser.SysUser, []string{"id", "is_admin"})
+
+	if err != nil {
+		return err
+	} else if !isExist {
+		return errors.New("操作错误，用户信息不存在或已被删除")
+	} else if mSysUser.IsAdminUser() {
+		return errors.New("操作错误，超管不可删除")
+	}
 	return model2.Delete(mSysUser.SysUser)
 }