move_or_copy_file only ever relocates the single video file it locates
inside a torrent's content_path — a multi-file release's own folder
(sample clips, .nfo/.srt/.jpg sidecars) was left behind with nothing
pointing at it anymore once the torrent got removed from qBittorrent.
Verified against production: 18 of ~30 entries in the downloads
directory were exactly this — husk folders with the video long since
moved into the library. run_import_cycle now removes content_path
itself (guarded against ever equalling the downloads root) alongside
the existing delete_torrent call.
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