[#SIRH-20] Ajouter pour les forfaits le paiement de congés N-1 (#12)

| Numéro du ticket | Titre du ticket |
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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: #12
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

migrations/Version20260402064647.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260402064647 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add paid_leave_days column to employee_leave_balances for forfait N-1 leave payment';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE employee_leave_balances ADD paid_leave_days DOUBLE PRECISION DEFAULT 0 NOT NULL');
+        $this->addSql("COMMENT ON COLUMN employee_leave_balances.paid_leave_days IS 'Jours de conges N-1 payes par la RH (forfait uniquement).'");
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE employee_leave_balances DROP paid_leave_days');
+    }
+}