不止支持跨窗口，只要前端连接的是同一个内核都能同步 - [x] https://github.com/siyuan-note/siyuan/pull/9031 - [ ] https://github.com/siyuan-note/siyuan/pull/13681 - [ ] https://github.com/siyuan-note/siyuan/pull/13694
