feat(fs): add layered VFS framework with RAM and device filesystem implementations#1

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Dayuxiaoshui wants to merge 7 commits intoarceos-org:mainfrom

Dayuxiaoshui:main

Commits on Jun 5, 2025

feat(ci): upgrade rust toolchain to nightly-2025-05-20
Dayuxiaoshui
committed

Commits on Jun 12, 2025

test: Add comprehensive integration tests for axfs_devfs
Dayuxiaoshui
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style(devfs): apply automated formatting
Dayuxiaoshui
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Commits on Jun 16, 2025

test: Add comprehensive integration tests for axfs_ramfs and axfs_vfs
Dayuxiaoshui
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fix warning
Dayuxiaoshui
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fix warnings
Dayuxiaoshui
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complete the merge test
Dayuxiaoshui
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