[codex] Fix CLI boolean package options

[JscorpTech]

Summary

• Restore optional package cookiecutter choices to boolean values so the existing jst-django CLI can pass False/True extra context without failing choice validation.
• Keep minimal defaults by ordering each optional package choice as false, true.
• Update template validation to render through the Python cookiecutter API so tests match the real jst create path.

Validation

• python scripts/validate_template.py
• Python cookiecutter API render with all optional package flags set to False
• git diff --check

Context

jst create currently sends optional packages as booleans, for example cacheops=False. The previous no/yes cookiecutter choices rejected that value before project generation.