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/antigravity/test_git_sync.script.yaml

@@ -0,0 +1,9 @@
+summary: Test script for Git auto-sync
+description: Test workflow for Git auto-sync
+lock: '!inline u/antigravity/test_git_sync.script.lock'
+kind: script
+schema:
+  $schema: 'https://json-schema.org/draft/2020-12/schema'
+  type: object
+  properties: {}
+  required: []