feat(cloudflare-durable): add durable.bindingName config

[onmax]

Summary

Backport of #3875 for v2 branch.

Adds cloudflare.durable.bindingName config option to customize the Durable Object binding name used by defineWebSocketHandler.

• Default: $DurableObject (backwards compatible)
• Custom name is injected via import.meta._durableBindingName
• Auto-generates durable_objects.bindings in wrangler.json when deployConfig: true

Usage

export default defineNuxtConfig({
  nitro: {
    preset: 'cloudflare-durable',
    cloudflare: {
      deployConfig: true,
      durable: { bindingName: 'MyDO' }
    }
  }
})

Repro

https://github.com/onmax/repros/tree/main/nitro-3378

Related: #3378

[vercel]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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