Caddy did not start after 25.4.1 update because Caddy fails to start with a no longer available DNS plugin, this also leads to a config error in the Caddy Plugin. I know this was planned due to maintanance effort, but please delay something like this in Business Edition until next major release or place a warning in the patchnotes.
I moved your thread to the correct forum, but since 25.4.1 (25.4.2 is new since last week) has been out for a while I'm not entirely sure what to do. Support tiers are laid out in the documentation: caddy is not a core-maintained plugin and you could still revert it to an earlier version at least as an interim solution.
Cheers,
Franco