Folder create/rename/delete/move, photo move, heap convert, and file
rename now reject paths outside the caller's BasePath (403). Sources
resolved via PhotoPrism UIDs are re-checked in movePhotoFiles. The
USER_BASEPATHS reconciler also sets upload_path so client-app uploads
land inside the user's subtree.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
