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.

openspec/changes/mobile-responsive-parity/.pi-map.index.md

@@ -0,0 +1,23 @@
+# openspec/changes/mobile-responsive-parity (index)
+dir: openspec/changes/mobile-responsive-parity
+
+## role
+Planning and specification package documenting the design, requirements, and implementation plan for achieving mobile-responsive UI parity across a React frontend application.
+## parent
+index: openspec/changes/.pi-map.index.md
+map: openspec/changes/.pi-map.md
+## children
+-
+## files
+- design.md
+- proposal.md
+- spec.md
+- tasks.md
+- verify-report.md
+## links
+index: openspec/changes/mobile-responsive-parity/.pi-map.index.md
+map: openspec/changes/mobile-responsive-parity/.pi-map.md
+## workflows
+-
+## dirty
+-