Port 8889 conflicts with avatar-tap Streamlit service.
Updated mitmproxy-in instance to use port 8890 for HAProxy WAF routing.
Changes:
- UCI config: proxy_port and listen_port now default to 8890
- mitmproxyctl: Updated fallback defaults and documentation
- README: Updated architecture diagrams with correct port
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>