Fix the opera log cost_time parameter (#95)

Author: wu-clan

backend/app/middleware/opera_log_middleware.py

@@ -92,7 +92,7 @@ async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
         end_time = datetime.now()
         summary = request.scope.get('route').summary
         title = summary if summary != '' else request.scope.get('route').summary
-        cost_time = (end_time - start_time).total_seconds() / 1000.0
+        cost_time = (end_time - start_time).total_seconds() * 1000.0
 
         # 日志创建
         opera_log_in = CreateOperaLog(