Add Windmill workflows and Git auto-sync

- Add wmill.yaml configuration with includes for f/**, u/**, g/**
- Add sync_to_git.sh script for automatic Git synchronization
- Add initial workflows synced from Windmill:
  - Test script: u/antigravity/test_git_sync
  - Admin scripts: u/admin/hub_sync
  - Setup app: g/all/setup_app
  - Folders: f/app_custom, f/app_groups, f/app_themes

workflows/f/app_themes/folder.meta.yaml

@@ -0,0 +1,5 @@
+summary: null
+display_name: App Themes
+extra_perms:
+  g/all: false
+owners: []