feat: add traveler entity distinct from trip membership

backend/libs/trips/src/trips.module.ts

@@ -9,6 +9,8 @@ import { TripMembersService } from './trip-members.service';
 import { TripMembershipGuard } from './trip-membership.guard';
 import { TripInvitationsRepository } from './trip-invitations.repository';
 import { TripInvitationsService } from './trip-invitations.service';
+import { TravelersRepository } from './travelers.repository';
+import { TravelersService } from './travelers.service';
 
 @Module({
   imports: [DatabaseModule],
@@ -22,6 +24,8 @@ import { TripInvitationsService } from './trip-invitations.service';
     TripMembershipGuard,
     TripInvitationsRepository,
     TripInvitationsService,
+    TravelersRepository,
+    TravelersService,
   ],
   exports: [
     TripsService,
@@ -29,6 +33,7 @@ import { TripInvitationsService } from './trip-invitations.service';
     TripMembersService,
     TripMembershipGuard,
     TripInvitationsService,
+    TravelersService,
   ],
 })
 export class TripsLibModule {}