Improve oauth redirect

[k3-cat]

Background & Aim

I have migrated my existing instance from docker to podman and forget to set the RUSTDESK_API_RUSTAPI_API_SERVER. It still works fine until I tried to login via oauth and it brings me to 127.0.0.1:21114/xxxxx.

I think, accroading to web standers, the host part can be omited when redirect amount same host. So, my initial idead is just remove every host parts from the redirect url. However, I find it can be further improved when reading relavent codes.

Changes & Reasons

• Align all redirects or endpoint in responses with hostname in requests header (if possible)
• Remove RedirectURL from oauth config. As they are only checked, for security reasons, by the oauth provider for security reasons. Since the pervious change has already relaxed the needing of this field when generating responses, removing it can improve the overall robustness -- no need to chage a same setting multiple times at different configs.
• And thus, increase the db version by 1 (263 now)

[IamTaoChen]

If so, we also need to update the fronted web. The redirectUrl should display the reult(http(s)://xxx.xxx.xxx/_admin/xxxxx)

[k3-cat]

Yeah! You are right.
I totally forgot about the front end.

However, I will be quite busy this week... So maybe I'll fix it over the weekend if I get the work done.