chore: remove helper & util subpackage for relay

relay/adaptor/common.go

@@ -4,8 +4,8 @@ import (
 	"errors"
 	"fmt"
 	"github.com/gin-gonic/gin"
+	"github.com/songquanpeng/one-api/relay/client"
 	"github.com/songquanpeng/one-api/relay/meta"
-	"github.com/songquanpeng/one-api/relay/util"
 	"io"
 	"net/http"
 )
@@ -39,7 +39,7 @@ func DoRequestHelper(a Adaptor, c *gin.Context, meta *meta.Meta, requestBody io.
 }
 
 func DoRequest(c *gin.Context, req *http.Request) (*http.Response, error) {
-	resp, err := util.HTTPClient.Do(req)
+	resp, err := client.HTTPClient.Do(req)
 	if err != nil {
 		return nil, err
 	}