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/specs/service-storage/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/specs/service-storage (index)
+dir: openspec/specs/service-storage
+
+## role
+Specification document defining acceptance requirements and feature contracts for a per-service data storage and lifecycle layer.
+## parent
+index: openspec/specs/.pi-map.index.md
+map: openspec/specs/.pi-map.md
+## children
+-
+## files
+- spec.md
+## links
+index: openspec/specs/service-storage/.pi-map.index.md
+map: openspec/specs/service-storage/.pi-map.md
+## workflows
+-
+## dirty
+-