此API目前僅用於 OTP認證開發前 暫時使用，若OTP開發完畢後該規格還會再改或棄用
http post: http://localhost:8080/api/authenticate

request body:
{
    "username": "user",
    "password": "user"
}

response body:
{
    "id_token": "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJ1c2VyIiwiYXV0aCI6IlJPTEVfVVNFUiIsImV4cCI6MTYzNjQyNTk5Mn0.RinPRcsVABRg0OzJ9scRPmkl89o7N9Rx6os838GIeWbm6AmZmhsMzJ2nO8Uqa1iXX-bXRm5O0XvyFXeEzOEfqA"
}

目前可測試帳號有：user、test
帳密皆一樣