feat(setting): implémenter la suppression d'une ContentSource

- Ajoute DeleteContentSourceCommand + CommandHandler (CQRS)
- Expose DELETE /api/content-sources/{id} via API Platform (Resource, Provider, Processor)
- Ajoute 2 tests Feature (204 succès, 404 not found)
- Frontend : méthode delete() dans le repository, action deleteSource() dans le store
- Nouveau composant ContentSourceDeleteModal (modale de confirmation)
- Bouton Supprimer dans la toolbar de ScrapperEdit (visible en mode édition uniquement)

tests/Feature/Setting/DeleteContentSourceTest.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Feature\Setting;
+
+use App\Entity\ContentSource;
+use App\Tests\Feature\AbstractApiTestCase;
+use Symfony\Component\HttpFoundation\Response;
+use Zenstruck\Foundry\Test\ResetDatabase;
+
+final class DeleteContentSourceTest extends AbstractApiTestCase
+{
+    use ResetDatabase;
+
+    private int $sourceId;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $source = new ContentSource();
+        $source->setBaseUrl('https://mangadex.org')
+            ->setChapterUrlFormat('https://mangadex.org/chapter/{id}')
+            ->setScrapingType('html');
+
+        $this->entityManager->persist($source);
+        $this->entityManager->flush();
+
+        $this->sourceId = $source->getId();
+    }
+
+    public function testItDeletesSourceSuccessfully(): void
+    {
+        static::createClient()->request('DELETE', "/api/content-sources/{$this->sourceId}");
+
+        $this->assertResponseStatusCodeSame(Response::HTTP_NO_CONTENT);
+
+        $this->entityManager->clear();
+        $deletedSource = $this->entityManager->find(ContentSource::class, $this->sourceId);
+        $this->assertNull($deletedSource);
+    }
+
+    public function testItReturnsNotFoundWhenSourceDoesNotExist(): void
+    {
+        static::createClient()->request('DELETE', '/api/content-sources/999999');
+
+        $this->assertResponseStatusCodeSame(Response::HTTP_NOT_FOUND);
+    }
+}