Fix: Change deploy-site workflow trigger from ai to gh-pages branch

Co-authored-by: hustcc <7856674+hustcc@users.noreply.github.com>

Author: Copilot

.github/workflows/deploy-site.yml

@@ -3,7 +3,7 @@ name: Deploy Site to GitHub Pages
 on:
   push:
     branches:
-      - ai
+      - gh-pages
 
 permissions:
   contents: read