feat: Implement initial web application structure and HLS video playback support.

web/index.html

@@ -34,6 +34,8 @@
 
 <body>
   <div class="loading">Loading XtremFlow...</div>
+  <!-- HLS.js for HLS video playback on Chrome/Firefox -->
+  <script src="https://cdn.jsdelivr.net/npm/hls.js@latest"></script>
   <script src="flutter_bootstrap.js" async></script>
 </body>