feat: add access_until field for subscription api (#295)

* 支持从计费渠道端点返回日期

* fix: fix wrong git base

---------

Co-authored-by: JustSong <songquanpeng@foxmail.com>

controller/channel-billing.go

@@ -22,6 +22,7 @@ type OpenAISubscriptionResponse struct {
 	SoftLimitUSD       float64 `json:"soft_limit_usd"`
 	HardLimitUSD       float64 `json:"hard_limit_usd"`
 	SystemHardLimitUSD float64 `json:"system_hard_limit_usd"`
+	AccessUntil        int64   `json:"access_until"`
 }
 
 type OpenAIUsageDailyCost struct {
@@ -96,6 +97,9 @@ func GetResponseBody(method, url string, channel *model.Channel, headers http.He
 	if err != nil {
 		return nil, err
 	}
+	if res.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("status code: %d", res.StatusCode)
+	}
 	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err