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/u/admin/hub_sync.ts

@@ -0,0 +1,5 @@
+import * as wmill from "windmill-cli@1.566.1"
+
+export async function main() {
+  await wmill.hubPull({ workspace: "admins", token: process.env["WM_TOKEN"], baseUrl: process.env["BASE_URL"] });
+}