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fde3272825
Refactor the multi-layer EROFS storage handling to improve code
maintainability and reduce duplication.
Key changes:
(1) Extract update_storage_device() to unify device state management
for both multi-layer and standard storages
(2) Simplify handle_multi_layer_storage() to focus on device creation,
returning MultiLayerProcessResult struct instead of managing state
(3) Unify the processing flow in add_storages() with clear separation:
(4) Support multiple EROFS lower layers with dynamic lower-N mount paths
(5) Improve mkdir directive handling with deferred {{ mount 1 }}
resolution
This reduces code duplication, improves readability, and makes the
storage handling logic more consistent across different storage types.
Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>