Verify all 6 PyPI packages (cryptography, google-auth-oauthlib,
google-api-python-client, msal, webdavclient3, cachetools); all pass
slopcheck [OK]. Document HKDF+Fernet pattern, OAuth2 flows for Google
Drive and OneDrive, webdavclient3+asyncio.to_thread for WebDAV/Nextcloud,
SSRF ipaddress module approach, Redis OAuth state pattern, and
cachetools.TTLCache folder listing cache. Confirm cloud_connections table
and storage_backend columns already exist — no new Alembic migration needed.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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