fix: correct item reference in TopPicksService for accurate recommendation processing

Author: TimilsinaBimal

app/services/recommendation/top_picks.py

@@ -152,6 +152,7 @@ async def _fetch_recommendations_from_top_items(
         tasks = []
 
         for item in top_items:
+            item = item.item
             item_id = item.get("_id", "")
             if not item_id:
                 continue