- Add health check endpoint at GET /api/diagnostic/health
- Auth-protected via @require_login (no-op when AUTH_ENABLED=False)
- Checks database (SELECT 1) and Redis (ping) with 2s timeouts
- Returns healthy/degraded/unhealthy with per-check detail
- Returns HTTP 503 when database is down, 200 otherwise
- 7 new unit tests covering all status scenarios
- Update docs/API.md with Grafana/monitoring integration notes
- Fixes test_cors_headers_absent_when_disabled CI timeout
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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