bug fixes

features all done

push notification

- QR Code

- start postpone other ticket of the holder when call

- wait time decreasing

- generate system_wait_time

- chg call queue table wait time to issue time

- response validation msg

- Laravel passport

- Caller display (branch channel)

calling table bug fix (by itself??)

- display done(echo & vue)

- calculate avg_wait_time when queue closed

- transaction (issue ticket), fix report avg wait time bug