Gestion du changement de type de contrat + correction du calcule des RTT sur un contrat qui commence en milieu de semaine (#19)

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## Description de la PR

## Modification du .env

## Check list

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

Reviewed-on: #19
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

src/Entity/Employee.php

@@ -6,9 +6,11 @@ namespace App\Entity;
 
 use ApiPlatform\Metadata\ApiProperty;
 use ApiPlatform\Metadata\ApiResource;
+use App\Dto\Contracts\ContractPhase;
 use App\Dto\Employees\ContractHistoryItem;
 use App\Enum\ContractNature;
 use App\Repository\EmployeeRepository;
+use App\Service\Contracts\EmployeeContractPhaseResolver;
 use App\State\EmployeeWriteProcessor;
 use DateTimeImmutable;
 use Doctrine\Common\Collections\ArrayCollection;
@@ -428,6 +430,43 @@ class Employee
         );
     }
 
+    /**
+     * @return list<array{
+     *   id: int,
+     *   contractType: string,
+     *   weeklyHours: ?int,
+     *   isDriver: bool,
+     *   startDate: string,
+     *   endDate: ?string,
+     *   periodIds: list<int>,
+     *   isCurrent: bool,
+     *   contractNature: string
+     * }>
+     */
+    #[Groups(['employee:read'])]
+    public function getContractPhases(): array
+    {
+        // Read RTT_START_DATE directly here: the entity has no DI but must filter
+        // out contract phases that ended before the application's data start.
+        $rawDate  = $_SERVER['RTT_START_DATE'] ?? $_ENV['RTT_START_DATE'] ?? '';
+        $resolver = new EmployeeContractPhaseResolver(is_string($rawDate) ? $rawDate : '');
+
+        return array_map(
+            static fn (ContractPhase $phase): array => [
+                'id'             => $phase->id,
+                'contractType'   => $phase->contractType->value,
+                'weeklyHours'    => $phase->weeklyHours,
+                'isDriver'       => $phase->isDriver,
+                'startDate'      => $phase->startDate->format('Y-m-d'),
+                'endDate'        => $phase->endDate?->format('Y-m-d'),
+                'periodIds'      => $phase->periodIds,
+                'isCurrent'      => $phase->isCurrent,
+                'contractNature' => $phase->contractNature->value,
+            ],
+            $resolver->resolvePhases($this),
+        );
+    }
+
     private function resolveCurrentContractPeriod(): ?EmployeeContractPeriod
     {
         $today   = new DateTimeImmutable('today');