refactor: replace DeepCopy with Copy for request handling consistency

relay/common/relay_info.go

@@ -313,7 +313,7 @@ func GenRelayInfoResponses(c *gin.Context, request *dto.OpenAIResponsesRequest)
 	info.ResponsesUsageInfo = &ResponsesUsageInfo{
 		BuiltInTools: make(map[string]*BuildInToolInfo),
 	}
-	if len(request.Tools) > 0 {
+	if request.Tools != nil && len(*request.Tools) > 0 {
 		for _, tool := range request.GetToolsMap() {
 			toolType := common.Interface2String(tool["type"])
 			info.ResponsesUsageInfo.BuiltInTools[toolType] = &BuildInToolInfo{