Replaces the third-party `websockets` package with a self-contained
implementation built on asyncio.open_connection, ssl, hashlib, base64,
struct, and os — all Python stdlib modules available on TrueNAS OS.
The script now runs directly on TrueNAS without any pip install.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
