Real resources: expose Prometheus status/config as resources #16
Description
ID: resources.prometheus_status
Priority: P1
Component: mcp/resources + tools
Return resources for /status/runtimeinfo, /status/config, /status/tsdb; resource/read fetches fresh JSON or text.
Acceptance Criteria
- resources/list enumerates URIs like prometheus://status/tsdb
- resource/read resolves and fetches via client
- Mime types set (application/json, text/plain)
- Tests assert presence and readability
Estimate: 3