[WebUSB] Stop wasting time on virtual machines or compiling, just use my web version

Supports raw image(.img, .img.gz, .img.xz) and RKFW(.img) now.

<img width="1052" height="1320" alt="Image" src="https://github.com/user-attachments/assets/210fe489-7996-4bef-a055-281a9ffa4551" />

Online flasher: https://jjmgit.my.to/rktool-webusb/
Source: https://github.com/jjm2473/rktool-webusb