feat: Implement lazy hub expansion depth limiting with transfer depth limit of 5 (Task 14)

cmd/api/main.go

@@ -28,6 +28,7 @@ func main() {
 	http.HandleFunc("/v1/routes/search", makeHandler(RouteSearch, handlerCtx))
 	http.HandleFunc("/v1/routes/", makeHandler(RouteGeoJSON, handlerCtx))
 	http.HandleFunc("/v1/stations/", makeHandler(StationStatus, handlerCtx))
+	http.HandleFunc("/internal/admin/stations/", makeHandler(AdminStationStatus, handlerCtx))
 
 	log.Println("Trip Planner API starting on :8080")
 	log.Fatal(http.ListenAndServe(":8080", nil))