Autowired constructor

Autowired annotation for dependency injection

This annotation marks a field, setter, or constructor for automatic dependency injection.

Example Usage:

@Service()
class OrderService {
  @Autowired()
  late UserService userService;
  
  @Autowired()
  late PaymentService paymentService;
  
  @Autowired()
  late InventoryService? inventoryService;
  
  // Constructor injection (preferred)
  OrderService();
  
  Future<Order> createOrder(CreateOrderRequest request) async {
    final user = await userService.findById(request.userId);
    await inventoryService.reserveItems(request.items);
    final payment = await paymentService.processPayment(request.payment);
    
    return Order(
      id: generateId(),
      userId: user.id,
      items: request.items,
      payment: payment,
      createdAt: DateTime.now(),
    );
  }
}