refactor(manga): Chapter entité DDD de Manga + AggregateRoot

- Ajoute AggregateRoot dans Shared (domain events + pull pattern)
- Manga extends AggregateRoot, devient vrai aggregate root DDD
- Chapter passe de readonly à entité mutable avec MangaId VO
- Manga expose les méthodes domaine pour toute mutation de chapitre :
  addChapter, updateChapterTitle/Volume/Pages, hideChapter, removeChapterPages
- Supprime saveChapter/updateChapter/deleteChapter de MangaRepositoryInterface
- save(Manga) gère désormais la persistance des chapitres via pull pattern
- Tous les handlers/listeners passent par l'agrégat (plus d'accès direct)
- phparkitect autorise AggregateRoot dans les couches Domain

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/Domain/Manga/Application/CommandHandler/ImportChapterHandlerTest.php

@@ -76,19 +76,18 @@ class ImportChapterHandlerTest extends TestCase
             ['action', 'adventure'],
             'ongoing'
         );
-        $this->mangaRepository->save($manga);
-
-        // Create an existing chapter without pages
+        // Create an existing chapter without pages and add through the aggregate
         $existingChapter = new Chapter(
             new ChapterId('chapter-123'),
-            $mangaId,
+            new MangaId($mangaId),
             1.5,
             'Chapter 1.5',
             1,
             true,
             null
         );
-        $this->mangaRepository->saveChapter($existingChapter);
+        $manga->addChapter($existingChapter);
+        $this->mangaRepository->save($manga);
 
         // Import the same chapter with CBZ
         $cbzBinary = $this->createValidCbzBinary();
@@ -105,7 +104,7 @@ class ImportChapterHandlerTest extends TestCase
         $updatedChapter = $this->mangaRepository->findChapterById('chapter-123');
         $this->assertNotNull($updatedChapter);
         $this->assertEquals('chapter-123', $updatedChapter->getId());
-        $this->assertEquals($mangaId, $updatedChapter->getMangaId());
+        $this->assertEquals($mangaId, $updatedChapter->getMangaId()->getValue());
         $this->assertEquals(1.5, $updatedChapter->getNumber());
         $this->assertEquals('Chapter 1.5', $updatedChapter->getTitle());
         $this->assertEquals(1, $updatedChapter->getVolume());