feat: add nextconfig image allow url

Author: Ohh-889

playground/next.config.ts

@@ -1,7 +1,9 @@
 import type { NextConfig } from 'next';
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  images: {
+    domains: ['picsum.photos'] // 👈 添加允许的域名
+  }
 };
 
 export default nextConfig;