- route-health.sh: collect per-gateway status (loss, vpn, iperf) into JSON
- route-health.sh: write health.json for web-api consumption
- web-api: add GET /api/health endpoint serving health.json
- web-api: add POST/GET /api/googlevideo for CDN pattern management
- web-api: add health status sidebar with auto-refresh (30s)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>