feat: add a dev-only login and seed command

src/Controller/SecurityController.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\Routing\Attribute\Route;
+
+/**
+ * Gains /auth/init and /auth/check when OAuth2 against myep lands (plan step 6).
+ */
+final class SecurityController extends AbstractController
+{
+    /**
+     * Never executed: the firewall's logout listener intercepts this route.
+     */
+    #[Route('/logout', name: 'app_logout', methods: ['GET'])]
+    public function logout(): never
+    {
+        throw new \LogicException('Intercepted by the logout key on the main firewall.');
+    }
+}