Add a download limit feature

[kebe7jun]

In a production environment, if all bandwidth is consumed directly, other services will become unavailable.

[kebe7jun]

rclone: --bwlimit BwTimetable Bandwidth limit in KiB/s, or use suffix B|K|M|G|T|P or a full timetable

[kebe7jun]

/gemini how to do this?