[Feature Request] Support sync to WebDAV

[ktmzcpl]

It would be really useful to support syncing to WebDAV, so that we can support a large number of cloud providers (including self-built sync servers) and make syncing between Firefox and Chrome/Edge possible.
This feature has already been implemented in e.g. violentmonkey.

[lawchou]

可以试试这个，我用AI改的。
链接：https://www.123865.com/s/j5Z0jv-gyJ6d?pwd=xbNh#
提取码：xbNh