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>

migrations/Version20260302110000.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260302110000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add notifications table for user notification center';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE TABLE notifications (id SERIAL NOT NULL, recipient_id INT NOT NULL, title VARCHAR(120) NOT NULL, message TEXT NOT NULL, is_read BOOLEAN DEFAULT FALSE NOT NULL, created_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, PRIMARY KEY(id))');
+        $this->addSql('CREATE INDEX idx_notifications_recipient_read_created ON notifications (recipient_id, is_read, created_at)');
+        $this->addSql('CREATE INDEX IDX_6000B0D0E92F8F78 ON notifications (recipient_id)');
+        $this->addSql('ALTER TABLE notifications ADD CONSTRAINT FK_6000B0D0E92F8F78 FOREIGN KEY (recipient_id) REFERENCES users (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE notifications DROP CONSTRAINT FK_6000B0D0E92F8F78');
+        $this->addSql('DROP TABLE notifications');
+    }
+}