feat: Add health status and tools sections to Orbit configuration page

What does this MR do and why?

Adds health status monitoring, component health cards, and a tools section to the Orbit configuration page. Previously, the page only showed namespace indexes with toggles.

Status section — Fetches cluster health from GET /api/:version/orbit/status and displays the Orbit version, overall status badge (Healthy / Unhealthy / No connection), and per-component health cards (e.g. clickhouse, indexer) with colored status dots.

Tools section — Fetches available tools from GET /api/:version/orbit/tools and renders them as cards with descriptions, collapsible schema blocks (parsed from <toon> tags in the tool description), and sample prompts for known tools.

References

Relates to #591396 (closed)

Screenshots or screen recordings

Health status:

Tools:

How to set up and validate locally

1. Start the Knowledge Graph using tilt up

2. Port forward the GRPC port.

3. Enable the feature flags in a Rails console:

   Feature.enable(:knowledge_graph)
   Feature.enable(:knowledge_graph_infra)

4. Port-forward the GKG gRPC service from the K8s cluster:

   kubectl port-forward svc/gkg-webserver 50054:50054

5. Visit /-/orbit/configuration and verify:

   • The status section shows the cluster version and overall health badge
   • Component health cards render with green/red status dots
   • The tools section displays tool cards with collapsible schema blocks

MR acceptance checklist

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