Delete categories by inodes

Deletes one or more categories and all their descendants at every depth. EDIT permission is validated on each selected category and every descendant before anything is deleted; a category that fails validation is skipped whole. Accepts a JSON array of category inodes. Inodes that could not be deleted are reported in the fails list of the result with the failure reason (category does not exist, insufficient permissions, or a permission-protected descendant). successCount counts the requested inodes that were deleted, while deletedCount counts every category actually removed, descendants included.