use node: prefix for requires

mostly because code is being autogenerated by all the AI stuff using
this prefix. it's also used in the stack trace.

src/cloudron.js

@@ -10,7 +10,7 @@ exports = module.exports = {
     setLanguage,
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     BoxError = require('./boxerror.js'),
     constants = require('./constants.js'),
     cron = require('./cron.js'),