Add /metrics endpoint with Prometheus gauges for nodes, messages,
advertisements, telemetry, trace paths, events, and members. Include
per-node last_seen timestamps for alerting. Add Alertmanager service
to Docker Compose metrics profile with default blackhole receiver.
Add NodeNotSeen alert rule (48h threshold). Add 1h time window to
all windowed metrics alongside existing 24h/7d/30d windows.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add FastAPI application with lifespan management
- Implement bearer token authentication (read/admin levels)
- Create comprehensive REST API routes:
- Nodes: list, get by public key
- Node tags: CRUD operations
- Messages: list with filters, get by ID
- Advertisements: list with filters, get by ID
- Telemetry: list with filters, get by ID
- Trace paths: list with filters, get by ID
- Commands: send message, channel message, advertisement
- Dashboard: stats API and HTML dashboard
- Add API CLI command for running the server
- Create API test suite with 44 passing tests
Routes use proper RESTful status codes (201 Created, 204 No Content).
Authentication is optional - when keys not configured, endpoints are open.
