- Add TransferTime constants (AirportToCity, CityToStation, StationToStation)
- Update Edge struct with Synthetic field
- Enhance addSyntheticEdgesForNode to use constants and mark synthetic edges
- Update BuildGraphFromStations to set Synthetic field
- Mark synthetic edges in GeoJSON output as dashed lines
- Write TestSyntheticAirportCityEdges and TestRouteWithSyntheticAirportCityEdges tests
- Implement GET /v1/stations/{id}/status endpoint
- Returns station status (active/closed) based on real scheduled edges
- Add stationStatusResponse, cityResponse, routeSearchResponse, routeGeoJSONResponse types
- Add stub implementations for other API handlers to enable compilation
- Add TestHandlerStationStatus test passing
- Add Cost field to Edge and RouteLeg structs
- Propagate Cost in FindRoute itinerary creation
- Write TestRouteParetoRanking test verifying non-dominated route selection
- Add addSyntheticEdgesForNode function that connects nodes to city hubs
- Modify FindRoute to add synthetic edges as fallback when no route found
- Write TestFindRouteWithSyntheticFallback test
Co-Authored-By: Claude <noreply@anthropic.com>