Feature: #110453 - Derive PageRepository instances for another Context 

Description 

\TYPO3\CMS\Core\Domain\Repository\PageRepository is bound to a Context when it is created. That Context decides which language overlay and which workspace the resolved records belong to. Code that needed records for a different language - a link to a translated page, an hreflang tag, a menu rendered without overlays - had to clone the global Context, set the language aspect on the clone, and then create a new instance by hand:

$context = clone GeneralUtility::makeInstance(Context::class);
$context->setAspect('language', $languageAspect);
$pageRepository = GeneralUtility::makeInstance(PageRepository::class, $context);

This forced every consumer to build the object itself, which prevented PageRepository from being injected as a regular service.

Two methods now derive a new instance from an existing one:

public function withContext(Context $context): self
public function withLanguageAspect(LanguageAspect $languageAspect): self

withLanguageAspect() keeps every other aspect - workspace, visibility, frontend user - of the current Context and only exchanges the language aspect. withContext() replaces the Context as a whole and returns the same instance if the given Context is already the active one.

Both methods leave the original instance untouched, so a single injected PageRepository can serve as the starting point for any number of derived ones:

class MyLinkGenerator
{
    public function __construct(
        private readonly PageRepository $pageRepository,
    ) {}

    public function getTranslatedPage(int $pageId, LanguageAspect $languageAspect): array
    {
        return $this->pageRepository->withLanguageAspect($languageAspect)->getPage($pageId);
    }
}

Passing new LanguageAspect() resolves records without applying any language overlay at all.

Impact 

Extension authors can inject PageRepository through dependency injection and derive Context-specific instances where they are needed, instead of cloning a Context and calling GeneralUtility::makeInstance(PageRepository::class, $context) .

The existing constructor is unchanged and keeps working.