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/tests/.pi-map.md

@@ -4,12 +4,12 @@ dir: frontend/tests
 index: frontend/tests/.pi-map.index.md
 
 ## role
-Test suite validating frontend utility functions for user state management and UI model transformation.
+Test suite validating user state management and UI model transformation functions for the frontend application.
 ## files
 - userState.test.mjs | Tests user state utility functions for merging session activity with user data and resolving user selection by various identifiers | dep: node:assert/strict, node:test, ../src/userState.js
 - users.test.mjs | Tests the buildUserDrawerModel function that transforms user data into a UI drawer model with contact and permission details | dep: node:assert/strict, node:test, ../src/users.js
 ## arch
-Node.js Mocha/ES module test pattern testing pure data transformation functions in isolation.
+JavaScript test modules (Mocha/ES modules) following a unit testing pattern that verifies pure data transformation and state resolution logic.
 ## tags
 user, tests, data, node:assert, strict, node:test, src, js
 ## symbols