Docker only tracks where an app's data lives (its bind mounts), not how
big a bind-mounted host dir is — so named-volume accounting reads ~0 for
LibrePortal, whose app data lives in bind mounts. Add a generator that
reads each app's mount map from `docker inspect` and `du`s the directories
(via runFileOp, so it runs as the data-owning user and isn't blocked by
rootless UID mapping). `du -x` keeps each measurement on its own
filesystem, so data on a separate disk is reported as a distinct
"external" total. The generator self-throttles to ~10 min since du is
heavier than the per-minute metrics. Surfaced as a "Storage by app"
section on the Storage page.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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