### POST /signup/phone/exist 注册手机号是否已存在
POST {{base_url}}/v1/auth/signup/phone/exist HTTP/1.1
Content-Type: application/json

{
  "phone": "15968875425"
}

### POST /signup/email/exist 注册邮箱是否已存在
POST {{base_url}}/v1/auth/signup/email/exist HTTP/1.1
Content-Type: application/json

{
  "email": "ynwdlxm@163.com"
}

### POST /verify_code/captcha 图片验证码
POST {{base_url}}/v1/auth/verify_code/captcha HTTP/1.1
Content-Type: application/json