Move cache enablement to framework config

[gothick]

At the moment, our reverse proxy-style caching is hardcoded in the index.php. It think we're better off putting this in the Framework config.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[Copilot]

Pull request overview

Moves reverse-proxy HTTP caching enablement out of public/index.php and into Symfony framework configuration, and adds config typing support for the staging environment.

Changes:

• Remove environment-based CacheKernel wrapping from the front controller.
• Enable/configure framework.http_cache via framework.yaml with prod/staging blocks.
• Extend config/reference.php psalm array-shapes to include when@staging.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
public/index.php	Removes runtime cache-kernel wrapping and returns the base Kernel directly.
config/reference.php	Adds when@staging to psalm config and routes array-shapes.
config/packages/framework.yaml	Enables http_cache and adds when@prod/when@staging framework blocks.

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[Copilot]

Removing the CacheKernel wrapping here means the app will no longer run behind Symfony's HttpCache reverse-proxy kernel in prod/staging. The framework.http_cache setting configures HttpCache options/services, but it doesn't instantiate App\CacheKernel by itself; you still need to wrap the kernel (or enable HttpCache via Symfony Runtime options) to actually get reverse-proxy caching.

Suggested change

	return new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
	$kernel = new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
	if ('prod' === $kernel->getEnvironment()) {
	return new CacheKernel($kernel);
	}
	return $kernel;

[Copilot]

framework.http_cache: true is currently enabled globally (so it applies in dev/test too) and then duplicated again under when@prod/when@staging. If the intent is to enable reverse-proxy caching only for prod/staging (as the old index.php logic did), remove the global http_cache: true and keep it only in the relevant when@... blocks (or explicitly disable it in when@dev/when@test).

[Copilot]

The comment above http_method_override says staging/prod also call enableHttpMethodParameterOverride() in index.php, but this PR removes that reverse-proxy creation. Please update/remove that comment so the configuration documentation matches the actual bootstrapping approach.