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/routes/cloudron.js

@@ -11,7 +11,7 @@ exports = module.exports = {
     setTimeZone
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     BoxError = require('../boxerror.js'),
     cloudron = require('../cloudron.js'),
     HttpError = require('@cloudron/connect-lastmile').HttpError,