refactor: 默认头像为空

apps/web-antd/src/preferences.ts

@@ -13,6 +13,7 @@ export const overridesPreferences = defineOverridesPreferences({
     name: import.meta.env.VITE_APP_TITLE,
     enableRefreshToken: true,
     defaultHomePath: '/dashboard',
+    defaultAvatar: '',
   },
   logo: {
     // source: 'https://www.agrandtech.com.cn/favicon.ico',