fix: replace require() with express.static import for ESM compat

server/vite.ts

@@ -1,9 +1,11 @@
 import { type Express } from "express";
 import { createServer as createViteServer, createLogger } from "vite";
 import { type Server } from "http";
+import { createRequire } from "module";
 import viteConfig from "../vite.config";
 import fs from "fs";
 import path from "path";
+import express from "express";
 
 const viteLogger = createLogger();
 
@@ -48,7 +50,7 @@ export function serveStatic(app: Express) {
     throw new Error(`Production build not found at ${distPath}. Run 'npm run build' first.`);
   }
   app.use(
-    require("express").static(distPath, {
+    express.static(distPath, {
       maxAge: "1y",
       index: false,
     })