Refactor elimination feature and improve backoffice usability

This commit introduces a refactored EliminationFactory for better modularity, updates the elimination preparation process, and adds functionality to view eliminations. Backoffice templates and forms have been reorganized, minor translations were corrected, and additional assets like styles and flashes were included for enhanced user experience.

src/Controller/Backoffice/BackofficeController.php

@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controller\Backoffice;
+
+use App\Controller\AbstractController;
+use App\Entity\Season;
+use App\Entity\User;
+use App\Form\CreateSeasonFormType;
+use App\Repository\SeasonRepository;
+use App\Service\QuizSpreadsheetService;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+use Symfony\Component\HttpKernel\Attribute\AsController;
+use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Security\Http\Attribute\IsGranted;
+
+#[AsController]
+#[IsGranted('ROLE_USER')]
+final class BackofficeController extends AbstractController
+{
+    public function __construct(
+        private readonly SeasonRepository $seasonRepository,
+        private readonly Security $security,
+    ) {}
+
+    #[Route('/backoffice/', name: 'app_backoffice_index')]
+    public function index(): Response
+    {
+        $user = $this->getUser();
+        \assert($user instanceof User);
+
+        $seasons = $this->security->isGranted('ROLE_ADMIN')
+            ? $this->seasonRepository->findAll()
+            : $this->seasonRepository->getSeasonsForUser($user);
+
+        return $this->render('backoffice/index.html.twig', [
+            'seasons' => $seasons,
+        ]);
+    }
+
+    #[Route('/backoffice/add', name: 'app_backoffice_season_add', priority: 10)]
+    public function addSeason(Request $request, EntityManagerInterface $em): Response
+    {
+        $season = new Season();
+        $form = $this->createForm(CreateSeasonFormType::class, $season);
+
+        $form->handleRequest($request);
+
+        if ($form->isSubmitted() && $form->isValid()) {
+            $user = $this->getUser();
+            \assert($user instanceof User);
+
+            $season->addOwner($user);
+            $season->generateSeasonCode();
+
+            $em->persist($season);
+            $em->flush();
+
+            return $this->redirectToRoute('app_backoffice_season', ['seasonCode' => $season->getSeasonCode()]);
+        }
+
+        return $this->render('backoffice/season_add.html.twig', ['form' => $form]);
+    }
+
+    #[Route('/backoffice/template', name: 'app_backoffice_template', priority: 10)]
+    public function getTemplate(QuizSpreadsheetService $excel): Response
+    {
+        $response = new StreamedResponse($excel->generateTemplate());
+        $response->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
+        $response->headers->set('Content-Disposition', 'attachment; filename="template.xlsx"');
+
+        return $response;
+    }
+}