- Replace SSE endpoint (/api/price/stream) with WebSocket (/api/price/ws)
using ring-undertow-adapter's built-in WebSocket support
- Change Docker internal port from 4100 to 4101 to avoid conflicts with
local dev (make run still uses 4100)
- Add free-port.sh utility script
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Use Undertow dispatch for SSE handler to avoid Ring adapter conflict.
Add docker-compose.yml (port 4101 to coexist with local dev on 4100).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>