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fix: handle ENOTDIR in FileDataAccessor.getStats to prevent 500 on duplicate slug

When a file already exists at a given path, stat()-ing that path with a
trailing slash (e.g. test.json/) causes the OS to return ENOTDIR instead
of ENOENT. This error was not caught by getStats, causing it to propagate
as a raw OS error and result in a 500 InternalServerError on the second
POST with the same Slug header to a file-system-backed server.

Treating ENOTDIR the same as ENOENT (i.e. converting it to
NotFoundHttpError) means hasResource correctly returns false for the
container-style path check, allowing createSafeUri to fall back to a
UUID-based name for the duplicate upload.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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