simplify ui build

examples/simple-server/vite.config.ts

@@ -4,13 +4,13 @@ import { viteSingleFile } from "vite-plugin-singlefile";
 import { resolve } from "path";
 
 // Get the entry from environment variable, default to ui-react
-const entry = process.env.VITE_ENTRY || "ui-react";
+const uiPath = process.env.UI;
 
 export default defineConfig({
   plugins: [react(), viteSingleFile()],
   build: {
     rollupOptions: {
-      input: resolve(__dirname, `${entry}.html`),
+      input: uiPath,
     },
     outDir: `dist`,
     emptyOutDir: false,