feat: add checkEduid api endpoint

add new api route to check user eduid status via mysql2 query

pbl.js

@@ -10701,6 +10701,12 @@ router.route('/setEduid').all((req, res, next) => {
     getmysql2(req, res, "setEduid", json['userid'], json['eduid']);
 });
 
+//获取用户eduid
+router.route('/checkEduid').all((req, res, next) => {
+    var json = queryString(req.url);
+    getmysql2(req, res, "checkEduid", json['eduid']);
+});
+
 // 获取服务器时间
 router.route('/getServerTime').all((req, res, next) => {
     res.end(JSON.stringify({time: new Date().getTime()}));