Fix CI build by using build:site command for monorepo

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
       #  run: pnpm exec tsc --noEmit
 
       - name: Build
-        run: pnpm run build
+        run: pnpm run build:site
         env:
           NODE_ENV: production