Enhance DTOs and services to support sequence and operational status for coaches and stations

apps/edr-passenger-api/src/modules/fleet/fleet.service.ts

@@ -298,6 +298,7 @@ export class FleetService {
         arrangement: dto.arrangement,
         capacity: dto.capacity,
         status: dto.status,
+        sequence: dto.sequence,
       },
       include: { coachType: true },
     });
@@ -306,6 +307,10 @@ export class FleetService {
   async deleteCoach(id: string) {
     const coach = await this.prisma.coach.findUnique({ where: { id } });
     if (!coach) throw new NotFoundException('Coach not found');
+    
+    // Delete related seats first
+    await this.prisma.seat.deleteMany({ where: { coachId: id } });
+    
     return this.prisma.coach.delete({ where: { id } });
   }