Ajout des notification + page employé (#6)

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## 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/Repository/EmployeeLeaveBalanceRepository.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Repository;
+
+use App\Entity\Employee;
+use App\Entity\EmployeeLeaveBalance;
+use App\Enum\LeaveRuleCode;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<EmployeeLeaveBalance>
+ */
+final class EmployeeLeaveBalanceRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, EmployeeLeaveBalance::class);
+    }
+
+    public function findOneByEmployeeRuleAndYear(
+        Employee $employee,
+        LeaveRuleCode|string $ruleCode,
+        int $year
+    ): ?EmployeeLeaveBalance {
+        $ruleCodeValue = $ruleCode instanceof LeaveRuleCode ? $ruleCode->value : $ruleCode;
+
+        return $this->createQueryBuilder('b')
+            ->andWhere('b.employee = :employee')
+            ->andWhere('b.ruleCode = :ruleCode')
+            ->andWhere('b.year = :year')
+            ->setParameter('employee', $employee)
+            ->setParameter('ruleCode', $ruleCodeValue)
+            ->setParameter('year', $year)
+            ->setMaxResults(1)
+            ->getQuery()
+            ->getOneOrNullResult()
+        ;
+    }
+
+    public function findEarliestYearForEmployee(Employee $employee): ?int
+    {
+        $result = $this->createQueryBuilder('b')
+            ->select('MIN(b.year) AS year')
+            ->andWhere('b.employee = :employee')
+            ->setParameter('employee', $employee)
+            ->getQuery()
+            ->getOneOrNullResult()
+        ;
+
+        if (!is_array($result) || !array_key_exists('year', $result) || null === $result['year']) {
+            return null;
+        }
+
+        return (int) $result['year'];
+    }
+}