feat(create-vite): add option to scaffold Vite DevTools integration

[tangyuan0821]

Add --devtools CLI flag and interactive prompt for vite-plugin-vue-devtools. Adds the dependency to package.json and registers the plugin in vite.config.

Vue templates only. The package hooks into Vue runtime internals. No generic equivalent exists.

Alternatives:

• Generic devtools plugin: doesn't exist.
• Always on: contradicts minimal default.
• Other package names: issue listed vite-dev-tools as placeholder. The real package is vite-plugin-vue-devtools.

Off by default. Pass --devtools to enable.

close #22640

[sapphi-red]

Why does this only add it for Vue? Converting to draft as it doesn't have any description about why this is the way and what alternatives were explored.

[tangyuan0821]

vite-plugin-vue-devtools is Vue-specific — it hooks into Vue runtime internals. No framework-agnostic equivalent exists, so the option is scoped to Vue templates.

Updated the PR description with rationale and alternatives.