refactor: reorganize webdav-sync into dedicated directory

Clean up project structure by organizing WebDAV sync service properly.

Changes:
- Move scripts/comfyui_webdav_sync.py → webdav-sync/webdav_sync.py
- Create webdav-sync/requirements.txt with watchdog and webdavclient3
- Remove webdav dependencies from model-orchestrator/requirements.txt
- Delete unused scripts/ folder (start-all.sh, status.sh, stop-all.sh)
- Update supervisord.conf to use new path /workspace/ai/webdav-sync/webdav_sync.py

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

model-orchestrator/requirements.txt

@@ -4,5 +4,3 @@ httpx==0.25.1
 docker==6.1.3
 pyyaml==6.0.1
 pydantic==2.5.0
-watchdog==3.0.0
-webdavclient3==3.14.6