[Filesystem] create_directory

[slk333]

Describe the bug
It fails to create directories recursively aka nested directory at once, because the function validatePath will throw if the directory we want to create has no parent, which is the case in such scenario.

servers/src/filesystem/index.ts

Line 57 in ddffd23

async function validatePath(requestedPath: string): Promise<string> {

To Reproduce
Steps to reproduce the behavior:

1. Try to create a nested directory by giving the full path to claude

Expected behavior
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Logs
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Additional context
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