feat: ajout d'une route GetMangaByIdHandler.php et fix de la SearchBar.vue

src/Domain/Manga/Application/QueryHandler/GetMangaByIdHandler.php

@@ -32,6 +32,7 @@ readonly class GetMangaByIdHandler
             status: $manga->getStatus(),
             externalId: $manga->getExternalId()?->getValue(),
             imageUrl: $manga->getImageUrl(),
+            thumbnailUrl: $manga->getImageUrls()->getThumbnail(),
             rating: $manga->getRating()
         );
     }