fix: 修复流模式错误扣费的问题 (close #95)

relay/channel/openai/relay-openai.go

@@ -127,8 +127,8 @@ func OpenaiHandler(c *gin.Context, resp *http.Response, promptTokens int, model
 	}
 	if textResponse.Error.Type != "" {
 		return &dto.OpenAIErrorWithStatusCode{
-			OpenAIError: textResponse.Error,
-			StatusCode:  resp.StatusCode,
+			Error:      textResponse.Error,
+			StatusCode: resp.StatusCode,
 		}, nil
 	}
 	// Reset response body