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.

archive/tests/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: archive/tests
 
 ## role
-Legacy or archived test directory currently containing only a placeholder file with no active test code.
+Empty placeholder directory retained for historical/archived test files that are no longer actively used.
 ## parent
 index: archive/.pi-map.index.md
 map: archive/.pi-map.md

archive/tests/.pi-map.md

@@ -4,11 +4,11 @@ dir: archive/tests
 index: archive/tests/.pi-map.index.md
 
 ## role
-Legacy or archived test directory currently containing only a placeholder file with no active test code.
+Empty placeholder directory retained for historical/archived test files that are no longer actively used.
 ## files
 - .gitkeep | Swaps the position of two tmux panes within a window or between windows | dep: tmux, sh
 ## arch
-Empty placeholder structure using a `.gitkeep` file to preserve the directory in version control for potential future use.
+No active code; contains only a `.gitkeep` placeholder file (with an unrelated description) to preserve the directory structure in version control.
 ## tags
 tmux, swaps, position, two, panes, within, window, windows
 ## symbols