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/server.js

@@ -5,20 +5,20 @@ exports = module.exports = {
     stop
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     AuditSource = require('./auditsource.js'),
     constants = require('./constants.js'),
     debug = require('debug')('box:server'),
     eventlog = require('./eventlog.js'),
     express = require('express'),
-    http = require('http'),
+    http = require('node:http'),
     HttpError = require('@cloudron/connect-lastmile').HttpError,
     middleware = require('./middleware'),
     platform = require('./platform.js'),
     routes = require('./routes/index.js'),
     safe = require('safetydance'),
     users = require('./users.js'),
-    util = require('util'),
+    util = require('node:util'),
     ws = require('ws');
 
 let gHttpServer = null;