build(pyproject): add PyPI keywords and Trove classifiers to CLI packages

[ulises-jeremias]

Context

CNA npm packages advertise rich keywords. CPA pyproject.toml files for create-awesome-python-app and create-python-app-core currently omit keywords and useful Trove classifiers, which hurts PyPI discoverability.

Steps

1. Read both package pyproject.toml files under packages/.
2. Add a keywords list covering scaffold/fastapi/django/celery/typer/uv/cli themes.
3. Add classifiers for license, Python 3.12+, and code generators / developer tools.
4. Run uv build --all (or the repo's documented build command).

Acceptance criteria

• Keywords present on both packages
• Classifiers include Development Status, License, Programming Language :: Python :: 3.12 (or current), and a relevant Topic
• uv build --all succeeds
• No runtime behavior changes

Files

• packages/create-awesome-python-app/pyproject.toml
• packages/create-python-app-core/pyproject.toml

How to verify

uv build --all and inspect generated package metadata / PyPI-style keywords in the built dist if convenient.