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/network.js

@@ -22,13 +22,13 @@ exports = module.exports = {
     detectIP
 };
 
-const assert = require('assert'),
+const assert = require('node:assert'),
     BoxError = require('./boxerror.js'),
     constants = require('./constants.js'),
     cron = require('./cron.js'),
-    fs = require('fs'),
+    fs = require('node:fs'),
     ipaddr = require('./ipaddr.js'),
-    path = require('path'),
+    path = require('node:path'),
     paths = require('./paths.js'),
     safe = require('safetydance'),
     settings = require('./settings.js'),