share link random avatar (#3541)

* share link random avatar

* fix

* delete unused code

packages/service/support/user/schema.ts

@@ -3,22 +3,10 @@ const { Schema } = connectionMongo;
 import { hashStr } from '@fastgpt/global/common/string/tools';
 import type { UserModelSchema } from '@fastgpt/global/support/user/type';
 import { UserStatusEnum, userStatusMap } from '@fastgpt/global/support/user/constant';
+import { getRandomUserAvatar } from '@fastgpt/global/support/user/utils';
 
 export const userCollectionName = 'users';
 
-const defaultAvatars = [
-  '/imgs/avatar/RoyalBlueAvatar.svg',
-  '/imgs/avatar/PurpleAvatar.svg',
-  '/imgs/avatar/AdoraAvatar.svg',
-  '/imgs/avatar/OrangeAvatar.svg',
-  '/imgs/avatar/RedAvatar.svg',
-  '/imgs/avatar/GrayModernAvatar.svg',
-  '/imgs/avatar/TealAvatar.svg',
-  '/imgs/avatar/GreenAvatar.svg',
-  '/imgs/avatar/BrightBlueAvatar.svg',
-  '/imgs/avatar/BlueAvatar.svg'
-];
-
 const UserSchema = new Schema({
   status: {
     type: String,
@@ -47,7 +35,7 @@ const UserSchema = new Schema({
   },
   avatar: {
     type: String,
-    default: defaultAvatars[Math.floor(Math.random() * defaultAvatars.length)]
+    default: getRandomUserAvatar()
   },
 
   promotionRate: {