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)

src/Domain/Setting/Infrastructure/ApiPlatform/Resource/DeleteContentSourceResource.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Domain\Setting\Infrastructure\ApiPlatform\Resource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Delete;
+use App\Domain\Setting\Infrastructure\ApiPlatform\State\Processor\DeleteContentSourceStateProcessor;
+use App\Domain\Setting\Infrastructure\ApiPlatform\State\Provider\DeleteContentSourceStateProvider;
+
+#[ApiResource(
+    shortName: 'ContentSource',
+    operations: [
+        new Delete(
+            uriTemplate: '/content-sources/{id}',
+            provider: DeleteContentSourceStateProvider::class,
+            processor: DeleteContentSourceStateProcessor::class,
+            name: 'delete_content_source',
+            openapiContext: [
+                'summary' => 'Delete a content source',
+                'description' => 'Permanently deletes a content source',
+                'parameters' => [
+                    [
+                        'name' => 'id',
+                        'in' => 'path',
+                        'required' => true,
+                        'schema' => [
+                            'type' => 'integer'
+                        ],
+                        'description' => 'The content source ID'
+                    ]
+                ],
+                'responses' => [
+                    '204' => [
+                        'description' => 'Content source successfully deleted'
+                    ],
+                    '404' => [
+                        'description' => 'Content source not found'
+                    ]
+                ]
+            ]
+        )
+    ]
+)]
+class DeleteContentSourceResource
+{
+    public function __construct(
+        public int $id
+    ) {
+    }
+}