Add Directors Forecast interactive report section

Embeds a Directors Forecast section in the Reports sidebar (hard-coded
under "Directors Reports"). Worksheet tab: day-by-day OTB grid with
editable pickup rooms, dry/wet overrides, ML suggestion column and live
forecast recalculation. Report tab: forecast vs budget vs last-year
comparison, occupancy summary, weekly revenue bands and snapshot tracking.

Backend: forecast-db.js (read-only pool to forecasting_db), new tables
(forecast_sessions, day_overrides, forecast_snapshots) and full REST
routes under /api/directors-forecast. docker-compose FORECAST_DATABASE_URL
added.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -5,13 +5,12 @@ services:
       - apparmor=unconfined
     environment:
       - DATABASE_URL=${DATABASE_URL}
+      - FORECAST_DATABASE_URL=${FORECAST_DATABASE_URL:-}
       - CENTRAL_AUTH_SECRET=${CENTRAL_AUTH_SECRET}
       - SETTINGS_URL=${SETTINGS_URL}
       - SETTINGS_SECRET=${SETTINGS_SECRET}
       - APP_SLUG=reports
       - OFFICE_IP_CHECK=${OFFICE_IP_CHECK:-disabled}
-      - RESOS_API_KEY=${RESOS_API_KEY:-}
-      - SAMBA_DATABASE_URL=${SAMBA_DATABASE_URL:-}
     healthcheck:
       test: ["CMD-SHELL", "wget -qO- http://127.0.0.1:3001/health || exit 1"]
       interval: 10s