fix(manga): générer le CBZ de téléchargement depuis les dossiers de pages

Les endpoints de téléchargement chapitre/volume plantaient (500 "file does
not exist") car le FileService traitait `pagesDirectory` comme un CBZ. Le
service reconstruit maintenant l'archive à la volée à partir des images du
dossier, et le nom du fichier chapitre inclut le titre du manga et le numéro.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Feature/Manga/DownloadCbzTest.php

@@ -27,7 +27,7 @@ class DownloadCbzTest extends AbstractApiTestCase
             'number' => 1.0,
             'title' => 'Chapter 1',
             'visible' => true,
-            'cbzPath' => '/app/tests/Shared/Files/test-chapter.cbz',
+            'pagesDirectory' => '/app/tests/Shared/Files/test-pages',
         ]);
 
         $chapterId = $chapter->getId();
@@ -41,7 +41,7 @@ class DownloadCbzTest extends AbstractApiTestCase
         $response = static::getClient()->getResponse();
         $this->assertEquals('application/x-cbz', $response->headers->get('Content-Type'));
         $this->assertStringContainsString('attachment; filename=', $response->headers->get('Content-Disposition'));
-        $this->assertStringContainsString('test-chapter.cbz', $response->headers->get('Content-Disposition'));
+        $this->assertStringContainsString('Ch.001.cbz', $response->headers->get('Content-Disposition'));
     }
 
     public function testItReturns404ForNonExistentChapter(): void

tests/Feature/Manga/DownloadVolumeTest.php

@@ -27,7 +27,7 @@ class DownloadVolumeTest extends AbstractApiTestCase
             'manga' => $manga,
             'volume' => 1,
             'visible' => true,
-            'cbzPath' => __DIR__.'/../../Shared/Files/test-chapter.cbz',
+            'pagesDirectory' => __DIR__.'/../../Shared/Files/test-pages',
         ]);
 
         $mangaId = $manga->getId();
@@ -108,7 +108,7 @@ class DownloadVolumeTest extends AbstractApiTestCase
             'volume' => 1,
             'number' => 1.0,
             'visible' => true,
-            'cbzPath' => __DIR__.'/../../Shared/Files/test-chapter.cbz',
+            'pagesDirectory' => __DIR__.'/../../Shared/Files/test-pages',
         ]);
 
         ChapterFactory::createOne([
@@ -116,7 +116,7 @@ class DownloadVolumeTest extends AbstractApiTestCase
             'volume' => 1,
             'number' => 2.0,
             'visible' => false, // Soft deleted
-            'cbzPath' => __DIR__.'/../../Shared/Files/test-chapter.cbz',
+            'pagesDirectory' => __DIR__.'/../../Shared/Files/test-pages',
         ]);
 
         ChapterFactory::createOne([
@@ -132,7 +132,7 @@ class DownloadVolumeTest extends AbstractApiTestCase
             'volume' => 1,
             'number' => 4.0,
             'visible' => true,
-            'cbzPath' => __DIR__.'/../../Shared/Files/test-chapter.cbz',
+            'pagesDirectory' => __DIR__.'/../../Shared/Files/test-pages',
         ]);
 
         $mangaId = $manga->getId();