- Add api_uptime_seconds gauge to API service (5s update interval), matching the pattern used by trading/backtesting/ml-training services - Remove obsolete Web Gateway Uptime and Active WebSocket Connections panels from cockpit (web-gateway is not deployed) - Add API Gateway Uptime (api_uptime_seconds) and API Auth Rate (api_auth_requests_total) panels in their place Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>