The place-photo cache (uploads/photos/google) grew unbounded: a Wikimedia
geosearch path cached full-res originals despite requesting a 400px thumb,
the writer applied no size guard, nothing reclaimed orphaned files, and
backups archived the whole re-derivable cache verbatim.
- Prefer the scaled `thumburl` over the full-res `info.url` in the Commons
geosearch fallback.
- Downscale any cached image to <=800px JPEG via the existing jimp dep,
with a safe fallback to the original bytes on decode failure.
- Add sweepOrphans() (orphaned meta rows + stray files) wired into the
scheduler (startup + nightly), and removeIfUnreferenced() called on
place delete for prompt reclamation.
- Exclude the re-derivable photo/trek caches from backups; restores
self-heal as the cache dirs are recreated at startup.
jubnl