refactor: 将copy paste createFile移入utils

public/preload.js

@@ -1,4 +1,5 @@
 const { existsSync, readFileSync, writeFileSync, mkdirSync, watch } = require('fs')
+const { sep } = require('path')
 const crypto = require('crypto')
 const listener = require('./listener')
 const { clipboard } = require('electron')
@@ -11,6 +12,7 @@ window.exports = {
   writeFileSync,
   mkdirSync,
   watch,
+  sep,
   crypto,
   listener,
   clipboard,