debounce and improve config file watcher

[redneck-f25]

Thanks for your great work on chisel.

In my use case i often have to edit the authfile and the automatic reloading works almost always.

In this PR I added debouncing for fsnotify events, path normalization and case handling for Windows.

Somtimes, editors or update jobs do nasty things, which leads to multiple writes or renames.

touch .users.json~ # new config
truncate -s users.json
cat .users.json~ | tee users.json > /dev/null
rm .users.json~

touch .users.json~ # new config
cp -a users.config .users.config-
mv .users.config~ users.config
rm .users.config-

[Copilot]

Pull request overview

This PR improves automatic authfile reloading by watching the containing directory, debouncing filesystem events, and normalizing paths for matching.

Changes:

• Watches the authfile parent directory instead of the file itself.
• Adds path normalization and Windows case-insensitive path comparison.
• Debounces write/create/rename events before reloading users.

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