[liangmiQwQ]

The current vp create always migrates the project generated by a third-party create-xxx CLI: it migrates ESLint/Prettier/tsup and rewrites the project for Vite+. When the CLI already generates a Vite+ project (for example, the upcoming Vite+ option in create-vue, vuejs/create-vue#1175), this overrides choices the template made on purpose, such as keeping ESLint or its vite-plus version.

This PR makes vp create skip these migration steps when the generated standalone project already depends on vite-plus. Follows vp migrate's behavior for projects that already use Vite+.

• Only third-party templates are affected. Built-in and bundled templates still rely on the rewrite.
• Packages created inside a monorepo are still rewritten so they use the workspace catalog.
• VP_FORCE_MIGRATE=1 still runs the full migration.
• Git, hooks, agent instructions, editor configs, the package manager pin, and install still run as before.

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