refactor(group): update user group handling to utilize userUsableGroups directly and add GetUserGroupRatio function

controller/group.go

@@ -29,11 +29,11 @@ func GetUserGroups(c *gin.Context) {
 	userId := c.GetInt("id")
 	userGroup, _ = model.GetUserGroup(userId, false)
 	userUsableGroups := service.GetUserUsableGroups(userGroup)
-	for groupName, ratio := range ratio_setting.GetGroupRatioCopy() {
+	for groupName, _ := range ratio_setting.GetGroupRatioCopy() {
 		// UserUsableGroups contains the groups that the user can use
 		if desc, ok := userUsableGroups[groupName]; ok {
 			usableGroups[groupName] = map[string]interface{}{
-				"ratio": ratio,
+				"ratio": service.GetUserGroupRatio(userGroup, groupName),
 				"desc":  desc,
 			}
 		}

controller/playground.go

@@ -31,7 +31,7 @@ func Playground(c *gin.Context) {
 		return
 	}
 
-	group := c.GetString("group")
+	group := common.GetContextKeyString(c, constant.ContextKeyUsingGroup)
 	modelName := c.GetString("original_model")
 
 	userId := c.GetInt("id")