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.

backend/src/media_library_viewer_api/integrations/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: backend/src/media_library_viewer_api/integrations
 
 ## role
-Provides a plugin-style integration framework for declaring and registering external service connections (e.g., Grafana, Jellyfin, Prometheus) with config schemas, secrets, and widget definitions for the media library viewer API.
+Defines external service integrations (e.g., Jellyfin, Prometheus, Alertmanager) with configuration models, widget schemas, and data-fetching logic for the media library viewer API.
 ## parent
 index: backend/src/media_library_viewer_api/.pi-map.index.md
 map: backend/src/media_library_viewer_api/.pi-map.md
@@ -11,12 +11,13 @@ map: backend/src/media_library_viewer_api/.pi-map.md
 ## files
 - __init__.py
 - alertmanager.py
+- authentik.py
+- backups.py
 - base.py
-- grafana.py
 - jellyfin.py
-- jellyseerr.py
 - nextcloud.py
 - prometheus.py
+- qbittorrent.py
 - registry.py
 - ssh_tasks.py
 ## links
@@ -24,6 +25,6 @@ index: backend/src/media_library_viewer_api/integrations/.pi-map.index.md
 map: backend/src/media_library_viewer_api/integrations/.pi-map.md
 ## workflows
 - change integrations behavior
-  read: __init__.py, alertmanager.py, base.py
+  read: __init__.py, alertmanager.py, authentik.py
 ## dirty
 -