refactor(manga): merge ChapterRepositoryInterface into MangaRepositoryInterface + pagesDirectory

- Supprime ChapterRepositoryInterface du domaine Manga (et ses implémentations
  LegacyChapterRepository et InMemoryChapterRepository)
- Déplace toutes les méthodes chapter vers MangaRepositoryInterface avec nommage
  explicite (findChapterById, findVisibleChapterById, updateChapter, deleteChapter, etc.)
- Remplace cbzPath par pagesDirectory + pageCount dans le modèle Chapter
  (transition : toChapterDomain conserve un fallback cbzPath pour les données existantes,
  updateChapter synchronise les deux colonnes jusqu'à la Phase 4)
- Ajoute la migration Doctrine (pages_directory, page_count sur la table chapter)
- Met à jour tous les handlers, listeners, query handlers et state providers du domaine
  Manga pour injecter uniquement MangaRepositoryInterface
- Adapte les tests unitaires et InMemoryMangaRepository avec les nouvelles méthodes

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

migrations/Version20260309165048.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260309165048 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE chapter ADD pages_directory VARCHAR(255) DEFAULT NULL');
+        $this->addSql('ALTER TABLE chapter ADD page_count INT DEFAULT 0 NOT NULL');
+        $this->addSql('DROP INDEX idx_available_at');
+        $this->addSql('DROP INDEX idx_delivered_at');
+        $this->addSql('DROP INDEX idx_queue_available');
+        $this->addSql('DROP INDEX idx_queue_name');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE SCHEMA public');
+        $this->addSql('CREATE INDEX idx_available_at ON messenger_messages (available_at)');
+        $this->addSql('CREATE INDEX idx_delivered_at ON messenger_messages (delivered_at)');
+        $this->addSql('CREATE INDEX idx_queue_available ON messenger_messages (queue_name, available_at)');
+        $this->addSql('CREATE INDEX idx_queue_name ON messenger_messages (queue_name)');
+        $this->addSql('ALTER TABLE chapter DROP pages_directory');
+        $this->addSql('ALTER TABLE chapter DROP page_count');
+    }
+}