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.

.claude/skills/.pi-map.md

@@ -4,10 +4,10 @@ dir: .claude/skills
 index: .claude/skills/.pi-map.index.md
 
 ## role
-Directory containing custom skill definitions and capability instructions for the Claude AI assistant integration.
+Configuration directory storing reusable Claude AI skill definitions and behavioral instructions for the project.
 ## files
 ## arch
-Flat configuration file structure defining modular skill behaviors and prompts used to extend Claude's domain-specific abilities.
+Flat directory structure with markdown-based skill modules that define specialized assistant capabilities.
 ## tags
 -
 ## symbols