Previously, removing a storage drive from the controller only marked it as
disconnected if the StoragePath entry still existed with Disconnected:true.
Drives removed entirely from storage_paths were invisible to the check,
causing Tier2 backup UI to show green "Sikeres" and scheduler to attempt
backups to a no-longer-managed destination.
New IsStoragePathKnown() method covers both cases. UI shows yellow
"Cél meghajtó leválasztva" and scheduler skips silently.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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