Admin-only page reachable from a new card on the admin panel (replacing the
Quick Actions card) that centralises housekeeping operations:
* Database integrity: PRAGMA integrity_check / quick_check / foreign_key_check,
plus VACUUM + ANALYZE to reclaim free space.
* Leftover records: detects and removes orphaned rows left behind by deleted
players/content (player_feedback, player_edit, playlist_content, dangling
player.playlist_id) and orphaned edited-media folders on disk.
* Player authentication tokens: manual reset (single or all), a configurable
automatic reset interval, and cancellation of a pending reset.
Resetting a token rotates player.auth_code and sets auth_reset_required, so the
next heartbeat (POST /api/player-feedback) answers 401 + auth_required and the
client restarts its authentication flow. A successful authentication clears the
flag and stamps auth_token_issued_at, from which the interval is measured.
New: PlayerAuthConfig model, add_player_auth_reset migration (registered in
docker-entrypoint.sh), admin/maintenance.html.
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