feat: add image management functionality and OCI registry support
- Introduced IMAGE_DIR constant for image storage path.
- Implemented image database schema and migration logic.
- Created image management functions: listImages, getImage, saveImage, deleteImage.
- Added ORAS binary setup and image push/pull functionality.
- Developed subcommands for image operations: pull, push, tag, and remove images.
- Enhanced error handling for image operations.
- Updated utility functions for image validation and size formatting.