chore: regenerate stale .pi-map.md / .pi-map.index.md project maps

Project map had drifted: claimed recharts unused (was used), ObservabilityPage.tsx
exists (refactored to service-tabs/), missed JellyfinNowPlayingWidget +
authentik/backups service types. Regenerate to reflect post-change reality:
new Qbittorrent/LineSeriesChart/Prometheus{Gauge,Mean}Widget files,
service_data.py/qbittorrent_store.py, canonical prometheus-charting +
service-storage specs, archived changes.

docs/superpowers/.pi-map.md

@@ -4,10 +4,10 @@ dir: docs/superpowers
 index: docs/superpowers/.pi-map.index.md
 
 ## role
-Documentation directory for advanced features, plugins, or capabilities (currently empty).
+Documentation directory for the project's "superpowers" feature set, concepts, or capabilities.
 ## files
 ## arch
-Flat file structure intended for Markdown or supplementary documentation resources.
+Flat file-based documentation structure with no code files present.
 ## tags
 -
 ## symbols