warn if `pages:extend` adds a route which replaces an existing route

Environment

• Operating System: Linux
• Node Version: v18.15.0
• Nuxt Version: 3.8.0
• CLI Version: 3.9.1
• Nitro Version: 2.7.0
• Package Manager: pnpm@8.7.6
• Builder: -
• User Config: -
• Runtime Modules: -
• Build Modules: -

Reproduction

1. Starts a module following https://nuxt.com/docs/guide/going-further/modules
2. Create a page in src/runtime/pages/test.vue (module);

<template><h1>Page from module</h1></template>

4. Register the page in src/module.ts:

extendPages((pages) => {
      pages.push({
        name: 'test',
        path: '/test',
        file: resolver.resolve('runtime', 'pages', 'test'),
      })
    })

5. Create a page in playground/pages/test.vue (playground):

<template><h1>Page from playground</h1></template>

6. Start the project
7. Navigate to http://localhost:3000/test

Describe the bug

The "Page from module" is displayed instead of the "Page from playground"

Additional context

Replacing pages.push with pages.unshift effectively displays the "playground" pages.

Using a different name (than the "generated one") in module such as: name: 'mymodule-test' fixes this but declares two pages (while the former re-group? both pages) in dev tools.

There is no warning or whatsoever that this page is declared twice.

As this is called extendPages I would expect this to not override project pages.

In my case I wan't to be able to "override" module pages from playground pages.

Logs

No response

Start with the extendPages callback in src/module.ts and reproduce the conflict using the module and playground pages described in the issue. Trace how the pages array handles duplicate names and paths; done means a duplicate route replacement is reported with a warning while the intended route behavior is clear.