Move inline template scripts into webpack-built assets

Several templates had their own <script> blocks instead of going
through webpack like game1.js already does. Extracted the waiting
page, lobby page, and admin session-log tab scripts into their own
files under assets/, imported from the main app.js entry. Since
app.js is already loaded on every page, each module just reads its
own data-* attributes and no-ops if its target element isn't present
on the current page - same pattern game1.js already uses.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

assets/app.js

@@ -5,3 +5,6 @@ import './styles/app.scss';
 import 'bootstrap/js/dist/collapse';
 import 'bootstrap/js/dist/alert';
 import 'bootstrap/js/dist/dropdown';
+import './game-waiting';
+import './game-lobby';
+import './admin-session-tabs';