feat(ci): replace github-pages shortcode with daily workflow

Fetch repos server-side via GitHub API using PAGES_FETCH_TOKEN and
inject the pages list into content/page/pages/index.md between HTML
markers. Runs daily at 00:00 Asia/Saigon and on manual dispatch.

.github/workflows/update-pages.yml

@@ -0,0 +1,49 @@
+name: Update GitHub Pages list
+
+on:
+  schedule:
+    # 00:00 Asia/Saigon (UTC+7) = 17:00 UTC
+    - cron: "0 17 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+concurrency:
+  group: update-pages
+  cancel-in-progress: false
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    env:
+      TZ: Asia/Ho_Chi_Minh
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          # Use PAT so the subsequent commit+push triggers the build workflow.
+          token: ${{ secrets.PAGES_FETCH_TOKEN }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+
+      - name: Refresh pages list
+        env:
+          GH_TOKEN: ${{ secrets.PAGES_FETCH_TOKEN }}
+          GH_USER: tiennm99
+        run: node .github/scripts/update-pages-list.mjs
+
+      - name: Commit and push
+        run: |
+          if [[ -z "$(git status --porcelain content/page/pages/index.md)" ]]; then
+            echo "No changes to commit."
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add content/page/pages/index.md
+          git commit -m "chore(pages): refresh GitHub Pages list"
+          git push