Add /clear-all endpoint and wire it to the tap handler so tapping the
display dismisses active warnings/critical alerts. Fix docker detector
to track restart count deltas instead of relying on the transient
"restarting" state. Wrap cleanup thread in try/except so it can't die
silently and leave events stuck forever.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
