接⼝描述： 通过appkey和secret获取登录凭证
请求参数：
请求示例：
POST /v1/auth HTTP/1.1
Content-Type: application/json
{
"appkey":"xxxx",
"secret":"xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
}
响应参数：
响应示例：
HTTP/1.1 200 OK
Content-Type: application/json
{
"data":{
"token":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"expire_at":1626677133934
},
"code":1,
}