API functions now build the full localized path matching the Angular
EndpointService pattern (/api/flights/{version}/{locale}/{endpoint}).
The dev proxy forwards /api and /flights to the test backend.
Phase 4A: Define IFlightRoute, IMapMarker, IMapPolyline types; implement
searchDestinations and getFlightsMapCalendar API functions with 11 tests;
add useFlightsMapSearch, useFlightsMapCalendar hooks; add FEATURE_FLIGHTS_MAP
env var for feature flag gating.
gnezim