Adds two admin-gated endpoints on the review queue router: POST /:itemId/images/:imageId/remove-background and POST /:itemId/images/:imageId/restore-original. Both run synchronously and reuse the same backgroundRemoval module the drafting worker uses, so a cut-out obtained either way is identical and either can be undone by Restore.
Ownership is scoped by item as well as by image (imageOfItem selects on id AND item_id), because the image id is a serial and guessing one is easy — a photo belonging to a different submission must not be reachable through another item's URL. A sidecar failure returns 502, not 500, and leaves the row untouched, since removeImageBackground only writes the row after the cut-out file already exists on disk.
GET /api/admin/item-drafts now returns { drafts, backgroundRemoval } instead of { drafts }, and each image in the payload gains original_image_path, which is what the review queue UI will use to decide between "Remove background" and "Restore original". DRAFT_SELECT's images aggregate is extended accordingly, keeping the deliberate column spelling that guards against the upload_links token digest leaking into the response.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>