Windows startup crash with asyncio NotImplementedError in Playwright

Describe the bug On Windows, running poetry run uvicorn main:app --reload --port 7001 crashes with NotImplementedError during Playwright startup probe. This happens because uvicorn --reload defaults to SelectorEventLoop on Windows, which does not support child process transports needed by Playwrigh

To Reproduce Steps to reproduce the behavior:

1. Run the project on Windows.
2. In backend/, run poetry run uvicorn main:app --reload --port 7001.
3. Watch terminal during startup.
4. See error: Task exception was never retrieved: NotImplementedError.

Screenshots of backend AND frontend terminal logs

Backend startup complete. Debug mode is DISABLED. Task exception was never retrieved future: <Task finished name='Task-3' coro=<Connection.run() done, defined at ...\playwright_impl_connection.py:305> exception=NotImplementedError()> Traceback (most recent call last): File "...\playwright_impl_transport.py", line 120, in connect
self._proc = await asyncio.create_subprocess_exec(...) File "...\asyncio\base_events.py", line 528, in _make_subprocess_transport raise NotImplementedError NotImplementedError [screenshot_preview] Chromium unavailable — tool disabled.