"Run repair without external drive" kept the library on the internal disk,
but the API's unmounted-media guard refuses to create or use a database
beneath /media/wrolpi when it is not a mount. After onboarding without a
drive the API restarted forever with no database, and downloads were
blocked as "media not mounted".
The Controller now records the choice as drives.library_on_internal_disk in
controller.yaml -- the only source of it. The database guard and the
media_mounted check both read that marker, so require_media_mounted keeps
its meaning and needs no change. Onboarding a drive later clears the
marker, so it is never copied onto the drive.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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