GitLab

- Add scripts to download models and update configuration file
- Remove manual steps for modifying model paths
- Update documentation for both ModelScope and HuggingFace model downloads
- Improve user experience by automating the entire process

- Add function to get local LayoutReader model directory- Check and use local model directory if available
- Fall back to online model if local directory not found
- Update model initialization to support local path
- Refactor model loading in singleton class