fix(node): select the Windows-compatible event loop before asyncio.run

aiortc's ICE stack does not run on Windows' default ProactorEventLoop -- a
DataChannel handshake never completes. `platform.use_compatible_event_loop()`
switches to the SelectorEventLoop on win32, called at the top of `main()`
before `asyncio.run()`. No-op off Windows.

Known cost, for when the node runs on Windows: the SelectorEventLoop cannot
spawn subprocesses, so ffmpeg streaming (asyncio.create_subprocess_exec in
webrtc_server.py) needs a thread-based runner there. Tracked separately.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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