optimized prompt

app.py

@@ -415,7 +415,9 @@ def _score_items(items: List[Challenge], keyword: str, debug: bool = False) -> T
         "Items: " + json.dumps(compact) + "\n\n"
         "Instructions:\n"
         "- Consider skills, tags, and brief description.\n"
-        "- Higher prize is slightly better all else equal.\n"
+        "- Relevance matters most, but higher prize should be explicitly favored.\n"
+        "- When two items are similarly relevant, prioritize the one with the larger prize.\n"
+        "- Incorporate prize into the score (0-1), not just the reason.\n"
         "- Return ONLY JSON array of objects: [{id, score, reason}] where 0<=score<=1.\n"
         "- Do not include any extra text."
     )