- Add /devices/status endpoint showing which SDR is in use and by what mode
- Add real-time status panel on main dashboard with 5s auto-refresh
- Add Bias-T toggle to ADS-B dashboard with localStorage persistence
- Auto-detect correct dump1090 bias-t flag (--enable-biast vs unsupported)
- Standardize SDR device labels across all pages
Closes#102
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>