generate split js/css when building web (#792)

easytier-web/frontend/vite.config.ts

@@ -1,9 +1,9 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
-import { viteSingleFile } from "vite-plugin-singlefile"
+// import { viteSingleFile } from "vite-plugin-singlefile"
 
 // https://vite.dev/config/
 export default defineConfig({
   base: '',
-  plugins: [vue(), viteSingleFile()],
+  plugins: [vue(),/* viteSingleFile() */],
 })