feat(api-server): Add repeat mode and seek time API

[sent44]

I hate Javascript and its family now.

I do not define any type structures (and dont want to do it; dont know where to put it)
Just push this in my folk or do review comment thing idk and I will add it to PR. Same thing with the code order or rename something.

close #2504
maybe not close but good to know #2582

[JellyBrick]

Due to my personal circumstances, I can't review this PR before December 23. Sorry 🥲

[JellyBrick]

Thanks!

[sent44]

Hello @JellyBrick ,
Thank you for the merged.
I understand the change in API, it is my bad because I never know it is already exist.
Did you accident nuke some of the seek-time code or did you planned to not merge this feature? Since you completely remove it in #544b9e3 in another PR. (On phone, I cannot really fetch the name of PR and cannot remember its name)

[JellyBrick]

@sent44 The seek-time code does the same thing as song-info so you can use /api/v1/song-info instead.