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/Version20260306120000.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260306120000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Create employee_rtt_balances table for RTT opening balances.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE TABLE employee_rtt_balances (id SERIAL NOT NULL, employee_id INT NOT NULL, year INT NOT NULL, opening_minutes INT NOT NULL, is_locked BOOLEAN DEFAULT FALSE NOT NULL, created_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, updated_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, PRIMARY KEY(id))');
+        $this->addSql('CREATE UNIQUE INDEX uniq_employee_rtt_balance ON employee_rtt_balances (employee_id, year)');
+        $this->addSql('CREATE INDEX idx_rtt_balance_employee_year ON employee_rtt_balances (employee_id, year)');
+        $this->addSql('ALTER TABLE employee_rtt_balances ADD CONSTRAINT FK_rtt_balance_employee FOREIGN KEY (employee_id) REFERENCES employees (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP TABLE employee_rtt_balances');
+    }
+}