Bypass proxy for CLI health checks

[MKuBMax]

This extends the existing no-proxy fix to omlx.cli.launch_command so local health checks do not inherit system proxy settings.

Changes:

• Use requests.Session(trust_env=False) for the launch health probe in omly/cli.py
• Add a regression test that asserts the health check uses a session with trust_env disabled

Validation:

• uv run pytest -q tests/test_cli.py