* docs: add PDF chat tutorial with correct shell syntax
* docs: add PDF chat tutorial to navigation
* docs: add requests dependency for Python in pdf_chat tutorial
* docs: wrap TypeScript example in async function to fix top-level await error
* docs: add error handling for existing folders in pdf_chat tutorial
* docs: fix folders.list() to use response.folders property
* docs: await PDF download completion to fix race condition
* docs: use retrieve_by_name API for proper folder existence handling
* docs: fix upload API to use single request object and file stream
* docs: fix upload to use folderId as first parameter
* docs: simplify upload to use file stream directly
* docs: use three-parameter upload signature (folderId, file, options)
* docs: fix upload parameter order to (file, folderId, options)
* docs: fix attach to pass folderId directly instead of object
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