nits: create-tanstack: Deploy script defaults to `npm` even when created with other package manager

[mmrakt]

Which project does this relate to?

Start

Describe the bug

When scaffolding a new TanStack Start project using create @tanstack/start (via bun, pnpm, or yarn), the generated package.json contains a deploy script that hardcodes npm.

"deploy": "npm run build && wrangler deploy",  // Select Cloudflare for deployment adapter

Your Example Website or App

none

Steps to Reproduce the Bug or Issue

1. Run one of the following commands:
   • bun create @tanstack/start
   • pnpm create @tanstack/start
   • yarn create @tanstack/start
2. Select Cloudflare for the deployment adapter, and select defaults for all other items.
3. Open package.json.
4. Observe the deploy script.

Expected behavior

It should detect the package manager used and generate:
"deploy": "bun run build && ..."

Screenshots or Videos

No response

Platform

• Start Version: [1.132.0]
• OS: [macOS]
• Bun version: [1.2.19]

Additional context

No response