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.

monitoring/prometheus/.pi-map.md

@@ -4,11 +4,11 @@ dir: monitoring/prometheus
 index: monitoring/prometheus/.pi-map.index.md
 
 ## role
-Provides configuration for standalone Prometheus deployments to scrape and collect metrics from local infrastructure services and remote nodes.
+Provides Prometheus server configuration for scraping metrics from infrastructure components and remote nodes using standalone deployment.
 ## files
 - prometheus.standalone.yml | Configures Prometheus monitoring server to scrape metrics from itself, node exporters, Loki, Alertmanager, Grafana, and remote nodes via file-based service discovery | dep: alertmanager, node-exporter, loki, grafana, file-sd
 ## arch
-Uses a declarative static YAML configuration pattern leveraging file-based service discovery for dynamic remote target management.
+Declarative monitoring configuration using static targets and file-based service discovery patterns for federated metrics collection.
 ## tags
 node, loki, alertmanager, grafana, prometheus.standalone, configures, prometheus, monitoring
 ## symbols