v1.5: drop coursework framing

Docs refresh + dynamic live MAPE in About tab + 3 new figures

Real HRRR + true per-zone ISO-NE + 7-day rolling backtest from data repo

Real-time mode + 7-day backtest tab + EIA API integration

App: add Ensemble model toggle (Baseline + Chronos-Bolt-mini)

Initial deploy: live ISO-NE demand fetch + baseline inference