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/tests/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: backend/tests
 
 ## role
-Test suite providing unit and integration tests that validate API endpoints, configuration, external clients, utilities, and service logic across the backend.
+Comprehensive test suite providing unit and integration tests that validate the backend's API endpoints, external service clients, data persistence, and utility functions of a media library management dashboard.
 ## parent
 index: backend/.pi-map.index.md
 map: backend/.pi-map.md
@@ -11,8 +11,10 @@ map: backend/.pi-map.md
 ## files
 - __init__.py
 - test_api.py
+- test_authentik_client.py
 - test_backups.py
 - test_config.py
+- test_dashboards.py
 - test_domain_media.py
 - test_jellyseerr_client.py
 - test_jobs.py
@@ -20,6 +22,9 @@ map: backend/.pi-map.md
 - test_media_index.py
 - test_observability.py
 - test_path_utils.py
+- test_prometheus_range.py
+- test_qbittorrent_client.py
+- test_service_data.py
 - test_services.py
 - test_ssh_client.py
 - test_targets.py
@@ -30,9 +35,9 @@ index: backend/tests/.pi-map.index.md
 map: backend/tests/.pi-map.md
 ## workflows
 - change tests behavior
-  read: __init__.py, test_api.py, test_backups.py
+  read: __init__.py, test_api.py, test_authentik_client.py
 - change tests CLI
-  read: test_jellyseerr_client.py, test_ssh_client.py
+  read: test_authentik_client.py, test_jellyseerr_client.py, test_qbittorrent_client.py
 - change tests config
   read: test_config.py
 ## dirty