Create Vehicle

POST /vehicles

{
  "plateNumber": "ABC123",
  "model": "Toyota Camry",
  "color": "Blue",
  "year": 2020,
  "userId": "uuid"
}

{
  "success": true,
  "data": {
    "id": "uuid",
    "plateNumber": "ABC123",
    "model": "Toyota Camry"
  }
}