feat: update random name generator

backend/app/http/auth.go

@@ -1,8 +1,6 @@
 package http
 
 import (
-	"fmt"
-	"math/rand"
 	"net/url"
 	"time"
 
@@ -55,8 +53,8 @@ func (ctl *auth) Login(ctx fiber.Ctx, code, state, redirect string) error {
 		authUserInfo = &wechat.AuthorizeUserInfo{
 			City:       "",
 			Country:    "",
-			Headimgurl: fmt.Sprintf("/avatar/%d.jpeg", 1+rand.Intn(79)),
-			Nickname:   "暂未设置昵称",
+			Headimgurl: utils.RandomAvatar(),
+			Nickname:   utils.RandomNickname(),
 			Openid:     token.Openid,
 			Privilege:  []string{},
 			Province:   "",