feat: GetChapters endpoint + tests

src/Domain/Manga/Application/Response/ChapterResponse.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Domain\Manga\Application\Response;
+
+readonly class ChapterResponse
+{
+    public function __construct(
+        public string $id,
+        public float $number,
+        public ?string $title,
+        public ?int $volume,
+        public bool $isVisible,
+        public \DateTimeImmutable $createdAt
+    ) {}
+}