Rate-limited AniList client for discovery seeds (BL-0051)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/fixtures/anilist/fresh.json

@@ -0,0 +1,6 @@
+{"data":{"Page":{"media":[
+  {"id":501,"format":"MANGA","isAdult":false,
+    "title":{"romaji":"Atarashii Kaze","english":"New Wind","native":null},"synonyms":[],
+    "status":"RELEASING","startDate":{"year":2025},"averageScore":72,"popularity":2100,"trending":150,
+    "genres":["Sports"],"tags":[],"staff":{"edges":[]},"coverImage":{"extraLarge":null},"siteUrl":null}
+]}}}