web: set turbopack root

web/next.config.mjs

@@ -1,4 +1,8 @@
 /** @type {import('next').NextConfig} */
+import path from "path";
+import { fileURLToPath } from "url";
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
 const nextConfig = {
   output: "standalone",
   images: {
@@ -13,6 +17,9 @@ const nextConfig = {
       },
     ],
   },
+  turbopack: {
+    root: __dirname,
+  },
 };
 
 export default nextConfig;