Ajout des notification + page employé (#6)

| Numéro du ticket | Titre du ticket |
|------------------|-----------------|
|                  |                 |

## Description de la PR

## Modification du .env

## Check list

- [ ] Pas de régression
- [ ] TU/TI/TF rédigée
- [ ] TU/TI/TF OK
- [ ] CHANGELOG modifié

Reviewed-on: #6
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

src/Dto/Employees/ContractHistoryItem.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Dto\Employees;
+
+use Symfony\Component\Serializer\Attribute\Groups;
+
+final class ContractHistoryItem
+{
+    public function __construct(
+        #[Groups(['employee:read'])]
+        public ?int $contractId,
+        #[Groups(['employee:read'])]
+        public ?string $contractName,
+        #[Groups(['employee:read'])]
+        public ?float $weeklyHours,
+        #[Groups(['employee:read'])]
+        public string $contractNature,
+        #[Groups(['employee:read'])]
+        public string $startDate,
+        #[Groups(['employee:read'])]
+        public ?string $endDate,
+        #[Groups(['employee:read'])]
+        public ?string $comment = null,
+    ) {}
+}