feat(person): initial Person domain with entity, model and DTO

- Add PersonEntity in Data layer with Doctrine ORM attributes
- Add PersonModel in Logic layer for business logic
- Add immutable PersonDto in Shared layer
- Configure doctrine/orm dependency in composer.json
- Add Doctrine deprecation triggers to phpunit configuration

src/Shared/Person/DTO/PersonDto.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Person\DTO;
+
+readonly final class PersonDto
+{
+    public function __construct(
+        public int $id,
+        public string $anrede,
+        public string $vorname,
+        public string $name,
+        public string $geschlecht,
+        public ?string $titel = null,
+        public ?string $funktionstitel = null,
+    ) {
+    }
+}