- Refactor ORM annotations across entities for consistency.

- Adjusted migrations to align with refactored ORM annotations.
- Added new PHPStan and PHP-CS-Fixer configurations, including stricter rules.
- Introduced `tests/object-manager.php` to improve test environment setup.

tests/object-manager.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\Dotenv\Dotenv;
+use Tvdt\Kernel;
+
+require __DIR__.'/../vendor/autoload.php';
+
+new Dotenv()->bootEnv(__DIR__.'/../.env');
+
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$kernel->boot();
+
+return $kernel->getContainer()->get('doctrine')->getManager();