fix: decode ai-lab.js from Base64 back to proper JavaScript

The entire ai-lab.js file (139KB) was stored as a single Base64-encoded
string instead of actual JavaScript. The browser loaded it as a script
but couldn't parse it — AiLab was never defined, so the batch sim panel
never rendered.

Decoded the file back to its proper 2531-line JavaScript source. The
file already includes auto-initialization at the bottom:
  if (document.readyState === 'loading')
    document.addEventListener('DOMContentLoaded', AiLab.init);
  else AiLab.init();

Also removed the now-redundant DOMContentLoaded listener from
index.html since the JS file handles init itself.

ui/index.html

@@ -197,6 +197,5 @@
     </div>
 
     <script src="ai-lab.js"></script>
-    <script>document.addEventListener('DOMContentLoaded', () => AiLab.init());</script>
 </body>
 </html>