fix(watcher): publish sites event + auto-clean non-parked deleted sites

[geodro]

Two gaps observed after rm -rf ~/Lerd/neil on a registered site, reported as "neil still shows in the UI":

1. The fast fsnotify onRemoved path didn't fire. The park watcher's onRemoved callback at cmd/lerd/main.go:483 would have published eventbus.KindSites immediately, but the journal shows no Project deleted: neil line — only the Removing stale site: neil from the 30s periodic sweep 30 seconds later. Likely a Go fsnotify race with inotify's IN_DELETE_SELF / IN_IGNORED ordering on rm -rf; hard to reproduce deterministically. The slow path caught the deletion and updated sites.yaml + nginx — but never published eventbus.KindSites, so the dashboard kept showing neil until a manual refresh.

2. removeStale was gated on parked directories. The check if !underParked { continue } meant manually site_link'd sites outside any park never got cleaned when their directory was deleted. They'd sit in sites.yaml indefinitely, nginx 502'ing on every request.

Fixes

• 30s ticker now publishes eventbus.KindSites when removeStale reports changes, mirroring the onRemoved fast path. UI gets notified within one sweep interval regardless of which cleanup code path fired.
• removeStale drops the underParked gate. Every registered non-Ignored site is checked; if its path doesn't exist on disk, it gets the same vhost-remove + sites.yaml-remove treatment. Ignored sites are still preserved — the user explicitly parked them in that state and the sweep must not reap them.

Deliberately unchanged

Interval stays at 30 seconds. Not shortened per user preference ("no shorten of periodicy"). The eventbus push + wider sweep scope are what make the slow path feel responsive; tightening the tick frequency isn't necessary.

Tests

New cmd/lerd/main_test.go covers three cases:

• deleted non-parked site is removed from sites.yaml;
• live site is preserved;
• Ignored: true site with a dead path is NOT reaped.

Isolated via HOME / XDG_CONFIG_HOME / XDG_DATA_HOME temp-dir overrides so the tests don't touch the user's real sites.yaml.