获取站点信息

{
    "code": 0,
    "msg": "ok",
    "data": {
        "site_name": "统一账号",
        "site_logo": "string",
        "site_description": "string",
        "site_copyright": "string",
        "site_icp": "string",
        "allow_register": true,
        "captcha_type": "string"
    }
}