Update function with local server needs a rework

[ryukra]

Tried updating with the new function but I think its HORRIBLY executed.

The update is copying everything over to a seperate folder, that means if you have like 100gb models (thats not a lot especially with flux now) depending on what you have for a harddrive that could take HOURS.

If anything goes wrong, for example if you have some custom nodes installed (happened to me). You have to do everything again.

[Acly]

Regarding models:

• It usually moves models rather than copy, which is instant. I'm not sure why it's a copy for some people (something Python/Windows decides).
• You can put models somewhere else via extra_model_paths.yaml
• It would probably be best if the installer setup extra_model_paths.yaml by default to avoid the move/sometimes-copy. Didn't do it until now because of backwards compatibility, but I will give it a shot. Might break a thing in the next update, but should be much smoother afterwards.

Custom nodes: those are not supported for managed install. That's really out of scope, it's way too easy to nuke your install with custom nodes and impossible for a script to recover. If you need custom nodes use a separate ComfyUI install.