Hermes 607aea514b feat: harden SSE endpoint with typed events and Last-Event-ID ...

- Added monotonic event ID (Last-Event-ID) for reconnection support
- Events now emit typed: 'event: camera_status' for client-side filtering
- Initial connection event sends 'event: connected' with ID
- Reconnection acknowledgment via Last-Event-ID header
- CORS preflight (OPTIONS) handler
- Access-Control-Allow-Headers: Last-Event-ID
- Initial heartbeat shortened to 15s for faster detect (30s for steady)

Closes CUB-233.

2026-05-21 21:18:24 +00:00

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sse.go

feat: harden SSE endpoint with typed events and Last-Event-ID

2026-05-21 21:18:24 +00:00