refactor: migrate group ratio and user usable groups logic to new setting package

- Replaced references to common.GroupRatio and common.UserUsableGroups with corresponding functions from the new setting package across multiple controllers and services.
- Introduced new setting functions for managing group ratios and user usable groups, enhancing code organization and maintainability.
- Updated related functions to ensure consistent behavior with the new setting package integration.

controller/relay.go

@@ -17,6 +17,7 @@ import (
 	"one-api/relay/constant"
 	relayconstant "one-api/relay/constant"
 	"one-api/service"
+	"one-api/setting"
 	"strings"
 )
 
@@ -83,7 +84,7 @@ func Playground(c *gin.Context) {
 	if group == "" {
 		group = userGroup
 	} else {
-		if !common.GroupInUserUsableGroups(group) && group != userGroup {
+		if !setting.GroupInUserUsableGroups(group) && group != userGroup {
 			openaiErr = service.OpenAIErrorWrapperLocal(errors.New("无权访问该分组"), "group_not_allowed", http.StatusForbidden)
 			return
 		}