separate flight class api and transportation class api into different module

src/modules/flight-class/flight-class.mapper.ts

@@ -0,0 +1,20 @@
+import type { FlightClass } from "@/database/entities/flight-class.entity";
+import type { FlightMapper } from "@/modules/flight/flight.mapper";
+import type { FlightClassResponse } from "@/modules/flight/flight.types";
+
+export class FlightClassMapper {
+	public constructor(private readonly flightMapper: FlightMapper) {}
+
+	public mapEntityToResponse(flightClass: FlightClass): FlightClassResponse {
+		return {
+			id: flightClass.id,
+			flight: this.flightMapper.mapEntityToResponse(flightClass.flight),
+			class: flightClass.class,
+			seat_layout: flightClass.seatLayout,
+			baggage: flightClass.baggage,
+			cabin_baggage: flightClass.cabinBaggage,
+			created_at: flightClass.createdAt,
+			updated_at: flightClass.updatedAt,
+		};
+	}
+}