feat: Handle errors, validate model names, and calculate quota usage (#978)

- Improved error handling in various modules for better stability and responsiveness.
- Optimized code in several files for improved efficiency and readability.
- Enhanced user experience by providing more detailed error responses in the controller.
- Strengthened security by ignoring sensitive files in `.gitignore`.

controller/billing.go

@@ -22,7 +22,9 @@ func GetSubscription(c *gin.Context) {
 	} else {
 		userId := c.GetInt("id")
 		remainQuota, err = model.GetUserQuota(userId)
-		usedQuota, err = model.GetUserUsedQuota(userId)
+		if err != nil {
+			usedQuota, err = model.GetUserUsedQuota(userId)
+		}
 	}
 	if expiredTime <= 0 {
 		expiredTime = 0

controller/channel-test.go

@@ -90,7 +90,7 @@ func testChannel(channel *model.Channel, request openai.ChatRequest) (err error,
 		if response.Error.Message == "" {
 			response.Error.Message = "补全 tokens 非预期返回 0"
 		}
-		return errors.New(fmt.Sprintf("type %s, code %v, message %s", response.Error.Type, response.Error.Code, response.Error.Message)), &response.Error
+		return fmt.Errorf("type %s, code %v, message %s", response.Error.Type, response.Error.Code, response.Error.Message), &response.Error
 	}
 	return nil, nil
 }

controller/group.go

@@ -8,7 +8,7 @@ import (
 
 func GetGroups(c *gin.Context) {
 	groupNames := make([]string, 0)
-	for groupName, _ := range common.GroupRatio {
+	for groupName := range common.GroupRatio {
 		groupNames = append(groupNames, groupName)
 	}
 	c.JSON(http.StatusOK, gin.H{