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.

frontend/public/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: frontend/public
 
 ## role
-Provides static public assets for the frontend web application, including brand identity graphics and reusable UI icons.
+Provides static public assets for the frontend web application, including browser identity (favicon) and reusable UI iconography.
 ## parent
 index: frontend/.pi-map.index.md
 map: frontend/.pi-map.md

frontend/public/.pi-map.md

@@ -4,12 +4,12 @@ dir: frontend/public
 index: frontend/public/.pi-map.index.md
 
 ## role
-Provides static public assets for the frontend web application, including brand identity graphics and reusable UI icons.
+Provides static public assets for the frontend web application, including browser identity (favicon) and reusable UI iconography.
 ## files
 - favicon.svg | Defines a browser favicon as an SVG graphic featuring a stylized lightning bolt shape with purple and blue gradient glow effects.
 - icons.svg | Defines a collection of reusable SVG icon symbols (Bluesky, Discord, documentation, GitHub, social, X) for use in web applications via `<use>` references.
 ## arch
-Flat static asset directory following standard web application conventions, serving files directly at the root URL path without build processing.
+Flat static file directory following web application conventions where public assets are served directly at the root URL path without processing.
 ## tags
 favicon, defines, svg, icons, browser, graphic, featuring, stylized
 ## symbols