initial release

Py pi publication and automation (#33)

* chore: rename src/model to src/initium

* Adopt src/initium package layout

This commit migrates the project from top-level sibling imports to the conventional `initium.*` package namespace and updates the packaging metadata, entry points, and documentation to match the `src/initium` layout. It also adds the packaged `initium.setup_wheels` module and updates CI to invoke the wheel installer via `python -m initium.setup_wheels`.

* Fix test imports for package layout

Update test fixtures and checkpoint reload tests to import the training module from the package namespace (`initium.core_training`) instead of the top-level module. This matches the project layout and ensures the tests exercise the correct module during synthetic training and checkpoint restore flows.

* Fix dnc direct_url detection

Guard against `None` values when checking whether `dnc` was installed from a VCS checkout. This avoids false negatives when `direct_url.json` is missing and keeps the wheel setup logic aligned with git-based installs.

* Add GitHub workflow to publish to PyPI

Add .github/workflows/publish-pypi.yml which builds and validates source/wheel distributions and publishes them to PyPI on published releases. The workflow checks the release commit is reachable from main and that the release tag matches __version__ in src/__init__.py, uses Python 3.12, runs build and twine check, and publishes via pypa/gh-action-pypi-publish with OIDC (no stored PyPI token). Update README.md with publishing instructions and one-time Trusted Publisher setup for the pypi environment.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* formatted

* Rename PyPI package to initium-deeplearning

Update the package metadata and publishing workflow to publish the distribution under `initium-deeplearning` while keeping the Python import namespace as `initium`. The README now documents the new PyPI project name and Trusted Publisher setup so release instructions match the actual package configuration.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>