`--list-templates` / `--list-addons` + catalog fetch (stub URL)

[ulises-jeremias]

Summary

List from remote/stub templates catalog.

CNA mapping

CNA: list.ts + templates.ts catalog fetch.

Acceptance criteria

• Lists render readable tables (Rich)
• Works against local stub catalog for CI
• Respects catalog cache env

Blocked by

none

Blocks

none

Reference

Parity matrix (workspace): knowledge/create-python-app-parity-matrix.md
Reference repo: https://github.com/Create-Node-App/create-node-app

Parent epic

#5