Extend cross-mode analytics to include ACARS/VDL2 message counts, APRS
stations, and Meshtastic messages. Refactor count helpers into reusable
_safe_len() and _safe_route_attr() utilities. Add health checks for
rtlamr, dmr, and meshtastic modes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Adds a unified analytics mode under the Security nav group that aggregates
data across all signal modes. Includes emergency squawk alerting (7700/7600/7500),
vertical rate anomaly detection, ACARS/VDL2-to-ADS-B flight correlation,
geofence zones with enter/exit detection for aircraft/vessels/APRS stations,
temporal pattern detection, RSSI history tracking, Meshtastic topology mapping,
and JSON/CSV data export.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
