add simple-host example

examples/simple-server/vite.config.ts

@@ -1,16 +1,23 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 import { viteSingleFile } from "vite-plugin-singlefile";
-import { resolve } from "path";
 
-// Get the entry from environment variable, default to ui-react
-const uiPath = process.env.UI;
+const INPUT = process.env.INPUT;
+if (!INPUT) {
+  throw new Error("INPUT environment variable is not set");
+}
+
+const isDevelopment = process.env.NODE_ENV === "development";
 
 export default defineConfig({
   plugins: [react(), viteSingleFile()],
   build: {
+    sourcemap: isDevelopment ? "inline" : undefined,
+    cssMinify: !isDevelopment,
+    minify: !isDevelopment,
+
     rollupOptions: {
-      input: uiPath,
+      input: INPUT,
     },
     outDir: `dist`,
     emptyOutDir: false,