Ajout des notification + page employé (#6)

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

migrations/Version20260309160000.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260309160000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add unique constraint on employee_rtt_payments (employee_id, year, month, rate).';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE UNIQUE INDEX uniq_rtt_payment_employee_year_month_rate ON employee_rtt_payments (employee_id, year, month, rate)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP INDEX uniq_rtt_payment_employee_year_month_rate');
+    }
+}