Add manual trigger and workflow file monitoring to docs deployment

Author: WenyinWei

.github/workflows/docs-deploy.yml

@@ -9,6 +9,10 @@ on:
       - 'docs/**'
       - 'Doxyfile'
       - 'tools/scripts/build_docs.sh'
+      - '.github/workflows/docs-deploy.yml'
+  workflow_dispatch:  # Allow manual triggering
+  schedule:
+    - cron: '0 6 * * 1'  # Weekly on Monday at 6 AM UTC
 
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