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/src/widgets/.pi-map.index.md

@@ -2,18 +2,26 @@
 dir: frontend/src/widgets
 
 ## role
-Provides a collection of self-contained, UI-driven dashboard widgets that fetch and render data from various external services and integrations.
+Dashboard widget components that render visual data for various integrations (Alertmanager, Backups, Jellyfin, Prometheus, qBittorrent, SSH tasks, static content) within the monitoring application.
 ## parent
 index: frontend/src/.pi-map.index.md
 map: frontend/src/.pi-map.md
 ## children
--
+- frontend/src/widgets/__tests__
+  index: frontend/src/widgets/__tests__/.pi-map.index.md
+  map: frontend/src/widgets/__tests__/.pi-map.md
 ## files
 - AlertmanagerAlertsWidget.tsx
 - BackupsWidget.tsx
-- GrafanaLinkWidget.tsx
+- JellyfinNowPlayingWidget.tsx
 - JellyfinWidget.tsx
+- PrometheusChartWidget.tsx
+- PrometheusGaugeWidget.tsx
+- PrometheusMeanWidget.tsx
 - PrometheusMetricWidget.tsx
+- QbittorrentActiveTorrentsWidget.tsx
+- QbittorrentSpeedWidget.tsx
+- QbittorrentTotalsWidget.tsx
 - SshTaskWidget.tsx
 - StaticWidget.tsx
 - index.ts
@@ -22,6 +30,8 @@ index: frontend/src/widgets/.pi-map.index.md
 map: frontend/src/widgets/.pi-map.md
 ## workflows
 - change widgets behavior
-  read: AlertmanagerAlertsWidget.tsx, BackupsWidget.tsx, GrafanaLinkWidget.tsx
+  read: AlertmanagerAlertsWidget.tsx, BackupsWidget.tsx, JellyfinNowPlayingWidget.tsx
+- explore widgets subdirectories
+  index: frontend/src/widgets/__tests__/.pi-map.index.md
 ## dirty
 -