http post:
http://localhost:8080/api/otp/sendOtp

request body:
{
    "loginType":"SMS",          // "SMS"：Otp發送手機，"EMAIL":Otp發email
    "account": "0912345678",    // 若loginType填SMS則該欄帶入手機、EMAIL則帶入郵件信箱
}

response body:
{
    "indexKey": "7c8c38a2",     // 用於帶入otp認證時
    "success": true,            // Otp是否有成功發送
    "failCode": "",             // "05"為信箱有誤
                                // "07"為發送失敗
                                // "08"為手機有誤
                                // 若為此之外的錯誤代碼，則皆為OTP系統錯誤
    "failReason": ""
}