Ability to manually specify locale in SSR

### Description

There is no way to specify locale in [`AngularAppEngine#handle`](https://github.com/angular/angular-cli/blob/19.0.0/packages/angular/ssr/src/app-engine.ts#L65-L69) based on [`Accept-Language`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language), [`Cookie`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cookie), etc. The current implementation of [`AngularAppEngine`](https://github.com/angular/angular-cli/blob/19.0.0/packages/angular/ssr/src/app-engine.ts#L24) chooses locale based on URL.

### Describe the solution you'd like

Ability to specify an array of locales when calling `handle`:

```diff
app.use('/**', (req, res, next) => {
angularApp
- .handle(req)
+ .handle(req, undefined, { locales: req.acceptsLanguages() })
.then((response) =>
response ? writeResponseToNodeResponse(response, res) : next(),
)
```

As far as I understand, this will also require removing the locale prefix from ``.

### Describe alternatives you've considered

_No response_

从 packages/angular/ssr/src/app-engine.ts 开始，重点查看 AngularAppEngine#handle 及其当前基于 URL 的 locale 选择。跟踪 locale 如何传递到渲染的文档中，然后验证调用方可以从请求数据提供一个有序的 locale 数组，并验证生成的 不会保留不需要的 locale 前缀。

由索引模型根据 Issue 内容生成。