fix(cli): update template handling for pnpm 11 (#10659)

* fix(cli): allow esbuild builds in Vite templates

* fix(cli): extend pnpm 11 build-script allowlists across app templates

- Add packages: [] to single-app pnpm-workspace.yaml so pnpm 9 does
  not reject the file with "packages field missing or empty".
- Add astro-app, react-router-app, start-app, next-app workspace
  yamls with the build-script allowlist each template needs
  (esbuild, sharp, unrs-resolver as applicable).
- Set msw: false across all app allowlists so the registry component
  install runs cleanly under pnpm 11 without executing msw's
  service-worker postinstall.
- Add a scaffold test pinning the packages:[] + allowBuilds shape
  so the parser keeps treating it as single-app.

* chore: changeset

* fix(templates): allow monorepo pnpm builds

* ci(templates): validate app workspace conversion

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Co-authored-by: shadcn <m@shadcn.com>