fix(ci): harden release workflows against PAT checkout failures

.github/workflows/sync-dev-after-release.yml

@@ -20,7 +20,8 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          token: ${{ secrets.PAT_TOKEN }}
+          # Prefer PAT when available, but fall back to built-in token to avoid hard dependency on PAT rotation.
+          token: ${{ secrets.PAT_TOKEN != '' && secrets.PAT_TOKEN || github.token }}
 
       - name: Configure Git
         run: |