feat: add observability endpoints for healthz and Prometheus metrics #8
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…eus integration This change introduces new operational endpoints for readiness and observability. The FastAPI app now exposes a /healthz endpoint with detailed component checks, and a /metrics endpoint compatible with Prometheus. The middleware records HTTP and pipeline metrics. All endpoints are documented and guarded by optional authentication if configured. Basic tests ensure endpoint and metric exposure, and Prometheus multi-process mode is supported for worker setups. - Adds /healthz with DB, Chroma, and worker liveness checks - Adds /metrics with HTTP and pipeline Prometheus metrics - Middleware tracks request counters/histograms - Endpoints are tested, and build/version info is shown BREAKING CHANGE: Prometheus is now a required dependency and endpoints /healthz and /metrics are reserved.
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Summary
This PR adds operational endpoints for readiness and runtime observability including Prometheus-compatible metrics and detailed health checks.
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