Add ability to configure a custom image scan directory in Settings:
- New "Image Scan Directory" field in Settings modal
- "Currently Monitoring" display shows active directory path
- Settings API now returns/saves gallery_root_path and monitored_directories
- Image monitor checks GalleryConfig before auto-detecting
- Restart notification when gallery path changes
Closes#76
- Add Google-style docstrings to main node files (prompt_manager.py, prompt_manager_text.py)
- Enhance database module docstrings with detailed parameter and return documentation
- Add comprehensive docstrings to all utils modules with usage examples
- Document API endpoints and configuration classes thoroughly
- Update module-level docstrings in all __init__.py files
- Ensure consistent naming (ComfyUI_PromptManager) across all documentation
- Follow Python best practices for docstring formatting