Added profile-update-interval applying logic

[sedyh]

Apply profile-update-interval header to auto-update logic

The profile-update-interval response header was already being parsed on add, but the stored value was never actually used. This wires it up so the server-suggested interval takes effect, matching the format that is similar to Clash Verge Rev.

Changes:

• clone now copies updateIntervalByProfile (was missing).
• update re-reads profile-update-interval header on every update, not only on add.
• updateByTicker uses server interval if available, falls back to user interval.

I can't build the app to check it on macos/ios since I don't have the libclash-vpn-service dependency and it is not public.

[sedyh]

I guess it should solve #324 but I don't have the way to test it.