Permanently remove a single product POS mapping by its id. The row is hard-deleted, not soft-deleted, so it will no longer appear in list or get responses and the id cannot be reused.

This removes only the link between the Distru product and the external POS product. It does not change the product, the connected retailer, or anything in the external POS catalog; it just stops Distru from treating them as the same product going forward. To repoint a product at a different POS product, delete the mapping and upsert a new one (or upsert over the existing one).

Returns 204 on success, 404 if no mapping with that id belongs to your company, or 403 if the authenticated user cannot access its product under their team restrictions.

Required permission: products_permissions_edit.