The gallery review flow builds its list from /prompt_manager/images/output,
whose id is a 16-hex path digest, but posted it as image_id to
autotag/single, so the server looked up a database row and every request
404ed. autotagSingleBody (pure, tested) now sends path for output-folder
entries and keeps image_id for database rows, which the admin review flow
(/images/all) still uses.