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

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

test/fixtures/anilist/creator.json

@@ -0,0 +1,10 @@
+{"data":{"Staff":{"staffMedia":{"edges":[
+  {"staffRole":"Story & Art","node":{"id":301,"format":"MANGA","isAdult":false,
+    "title":{"romaji":"Hoshi no Uta","english":"Star Song","native":null},"synonyms":[],
+    "status":"FINISHED","startDate":{"year":2018},"averageScore":79,"popularity":2500,"trending":3,
+    "genres":["Fantasy"],"tags":[],"staff":{"edges":[]},"coverImage":{"extraLarge":null},"siteUrl":null}},
+  {"staffRole":"Original Story","node":{"id":777,"format":"NOVEL","isAdult":false,
+    "title":{"romaji":"Hon no Tabi","english":null,"native":null},"synonyms":[],
+    "status":"FINISHED","startDate":{"year":2010},"averageScore":70,"popularity":1200,"trending":1,
+    "genres":[],"tags":[],"staff":{"edges":[]},"coverImage":{"extraLarge":null},"siteUrl":null}}
+]}}}}