* fix(aviation): unify NOTAM status logic between map and ops table
Both endpoints now use a shared NOTAM loader (seed-first with live
fallback) so they see the same closure snapshot. When an airport has
a NOTAM *and* real flight data, the new mergeNotamWithExistingAlert()
preserves observed stats instead of hard-replacing with severe/closure.
This fixes DXB showing NORMAL in the ops table but SEVERE on the map.
- Extract loadNotamClosures() to _shared.ts (used by both handlers)
- Add mergeNotamWithExistingAlert() for NOTAM + flight data merge
- Align ops-summary severity: NOTAM floor = moderate (operating) or
severe (no flights), matching the map's merge logic
- Fix OMAD → OMAA ICAO typo in seed MENA list (AUH)
* fix: resolve strict tsconfig type errors in API build
* fix(aviation): preserve closure delayType for NOTAM-closed airports
Downstream consumers (MapPopup, data-loader, country-instability) rely
on delayType === 'closure' as the only closure signal. Always set
delayType to closure in mergeNotamWithExistingAlert() since the NOTAM
confirms the airport is closed — severity is still nuanced by flight data.
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