fix(anilist): improve rate limit header parsing

src/libs/anilist/anilist-do.ts

@@ -310,7 +310,9 @@ export class AnilistDurableObject extends DurableObject {
 
     // 1. Handle Rate Limiting (429)
     if (response.status === 429) {
-      const retryAfter = response.headers.get("Retry-After");
+      const retryAfter = await response
+        .json()
+        .then(({ headers }) => headers["Retry-After"]);
       console.log("429, retrying in", retryAfter);
 
       await sleep(Number(retryAfter || 1) * 1000); // specific fallback or ensure logic