fix:批量修复了一些问题

src/api/routes/eval.py

@@ -19,13 +19,19 @@ router = APIRouter(prefix="/api/v1", tags=["eval"])
 async def settle(req: SettleRequest, db: AsyncSession = Depends(get_db)):
     """回填实际结果。
 
-    status 为 degraded/failed 的预测无法结算。
+    status 为 degraded/failed 的预测无法结算(返回 400);
+    记录不存在返回 404。
     """
     try:
         pred = await settle_prediction(req.prediction_id, req.home_goals, req.away_goals)
         return {"id": pred.id, "settled": pred.settled}
     except ValueError as e:
-        logger.warning("settle failed: %s", e)
+        msg = str(e)
+        # degraded/failed 拒绝:明确的 400,而非与"未找到"混为一谈
+        if "无法结算" in msg:
+            logger.warning("settle rejected: %s", msg)
+            raise HTTPException(400, msg)
+        logger.warning("settle failed: %s", msg)
         raise HTTPException(404, "预测记录不存在")
     except Exception as e:
         logger.exception("settle error")