feat: validate application date range against existing dispositions

src/Entity/Application.php

@@ -4,11 +4,13 @@ namespace App\Entity;
 
 use App\Entity\Traits\TimestampableEntity;
 use App\Repository\ApplicationRepository;
+use App\Validator\Constraints as AppAssert;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Uid\Uuid;
 
 #[ORM\Entity(repositoryClass: ApplicationRepository::class)]
+#[AppAssert\Application]
 class Application implements TimestampableEntityInterface
 {
     use TimestampableEntity;