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/clients/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: backend/src/media_library_viewer_api/clients
 
 ## role
-Provides HTTP and command execution client wrappers for integrating with external media services (Jellyfin, Jellyseerr) and performing remote/local filesystem inspection.
+Provides HTTP and command-line client wrappers for integrating with external media services (Jellyfin, Authentik, Jellyseerr, qBittorrent) and executing local/remote filesystem operations.
 ## parent
 index: backend/src/media_library_viewer_api/.pi-map.index.md
 map: backend/src/media_library_viewer_api/.pi-map.md
@@ -10,15 +10,17 @@ map: backend/src/media_library_viewer_api/.pi-map.md
 -
 ## files
 - __init__.py
+- authentik.py
 - jellyfin.py
 - jellyseerr.py
 - local.py
+- qbittorrent.py
 - ssh.py
 ## links
 index: backend/src/media_library_viewer_api/clients/.pi-map.index.md
 map: backend/src/media_library_viewer_api/clients/.pi-map.md
 ## workflows
 - change clients behavior
-  read: __init__.py, jellyfin.py, jellyseerr.py
+  read: __init__.py, authentik.py, jellyfin.py
 ## dirty
 -