feat: rename variables to support user configs

[34j]

Description of change

Closes #879

Pull-Request Checklist

• [ ] Code is up-to-date with the main branch
• [ ] This pull request follows the contributing guidelines.
• [ ] This pull request links relevant issues as Fixes #0000
• [ ] There are new or updated unit tests validating the change
• [ ] Documentation has been updated to reflect this change
• [ ] The new commits follow conventions outlined in the conventional commit spec, such as "fix(api): prevent racing of requests".

• If pre-commit.ci is failing, try pre-commit run -a for further information.
• If CI / test is failing, try uv run pytest for further information.

copier copy --trust --vcs-ref feat/support-user-configs "gh:34j/pypackage-template"