fix(cli): fail early on non-empty target dir (0.2.10)

[ulises-jeremias]

Summary

• Interactive scaffolding used to run the full wizard and then crash with a traceback when the default my-project/ (or any target) was already non-empty
• Validate emptiness before prompts; exit cleanly with a --force / rename hint
• Bump create-awesome-python-app + create-python-app-core to 0.2.10

Test plan

• uv run pytest packages/create-awesome-python-app/tests/test_cli.py packages/create-python-app-core/tests/test_config.py
• CI fully green
• After merge: tag create-awesome-python-app@0.2.10 and confirm PyPI / dist smoke

Manual repro (pre-fix)

mkdir -p my-project &&echo x > my-project/leftover
uvx create-awesome-python-app # wizard then NonEmptyTargetDirectoryError traceback

Post-fix: same command should fail immediately with a clear message.

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