1-hour workshop: Specify supported runtimes and align cross-platform prerequisites

Problem

content/1-hour/README.md requires only a "recent" Node.js and Python version. The current Astro dependency requires Node.js >=22.12.0, but this requirement is not declared in app/client/package.json or stated in the workshop. The same prerequisite section says a Bash-capable shell is required and tells Windows learners to install WSL or Git Bash, while content/1-hour/0-setup.md provides a native PowerShell startup path.

A learner can satisfy the written prerequisites and still fail during setup, or install an unnecessary shell on Windows.

Suggested change

Declare and document supported runtime versions, and describe Bash and PowerShell as alternative setup paths.

Acceptance criteria

• app/client/package.json declares the supported Node.js engine.
• The one-hour prerequisites state a concrete Node.js minimum or supported LTS release and a tested Python range.
• Native Windows learners are told that PowerShell is sufficient when using start-app.ps1.
• Bash/WSL guidance is limited to the Bash script path.
• Setup is tested using each documented shell path.

Start with app/client/package.json, content/1-hour/README.md, and content/1-hour/0-setup.md; compare the declared runtimes and the Bash and PowerShell setup paths. Run setup using each documented shell path, including start-app.ps1, and confirm the prerequisites, runtime versions, and Windows guidance match what works.