The default recipes dir (<first lora root>/recipes) is auto-created by the
recipe scanner and recorded by the model-root walks as an empty folder, so
it showed up in the folder sidebar — and since recipe files are not model
weight files, the folder delete endpoint's model_count check let a
right-click delete wipe the whole recipe library via shutil.rmtree.
- scan walks (full scan, reconcile, all-folders backfill) no longer descend
into the effective recipes dir, and get_all_folders() filters it out of
snapshots persisted before the exclusion existed
- delete_folder/rename_folder refuse the recipes dir and any ancestor of
it with code "protected"
- the delete modal renders a protected state (confirm hidden, per-row
checkbox disabled) instead of a deletable 'no models' prediction
- RecipeScanner.recipes_dir now shares the side-effect-free resolver in
py/utils/recipes_paths.py
