[Cloudflare] Environment & vite modes support

Describe the feature

Links:

• https://vite.dev/guide/env-and-mode#modes
• https://developers.cloudflare.com/workers/vite-plugin/reference/cloudflare-environments/

For a long time, Nitro has not supported Cloudflare environments. However, deploying by environment or enabling development is a very common requirement.

We could customize the main module entry point after compilation, but this would break the nitro/vite dev command.

The Cloudflare vite plugin offers a solution: combining the vite name and the environments name and configuring it using CLOUDFLARE_ENV. This greatly simplifies the generated deploy config (.output/server/wrangler.json).

Alternative: For vite, you can use @cloudflare/vite-plugin as the dev server. This alternative will break nitro dev, which I personally do not recommend.

Additional information

• Would you be willing to help implement this feature?

Read the linked Vite modes and Cloudflare environments documentation first, then inspect how the nitro/vite dev command and generated .output/server/wrangler.json are handled. Trace how CLOUDFLARE_ENV could combine the Vite and Cloudflare environment names without breaking nitro dev. Done means environment-based deployment and development work while the generated Wrangler configuration uses the selected environment.