refactor!: migrate from REST API to GraphQL

- Replace OpenAPI/REST endpoints with a single  route.
- Remove  and Swagger UI configuration.
- Disable OpenAPI schema extensions in Zod types.
- Refactor  to be request-agnostic.
- Update episode URL fetching to return standardized success/failure objects.
- Update project dependencies.

src/libs/anilist/anilist-do.ts

@@ -49,6 +49,9 @@ export class AnilistDurableObject extends DurableObject {
       { id },
       token,
     );
+    if (!anilistResponse) {
+      return null;
+    }
 
     // Extract next airing episode for alarm
     const media = anilistResponse.Media as ResultOf<