Reorganize the directory structures of `collect` and `diff`, and place them uniformly under `docker/script/`
Optimize the logic for generating differential packages, supporting automatic search and extraction of layers-collection.tar.gz.
- Add copying and updating of the client directory.
- Simplify naming of compressed packages by using fixed names: diff-package.tar.gz and layers-collection.tar.gz.
- Update the README.md documentation to provide clearer usage instructions and directory structure explanations
