Feature: Initial extension set up 

Description 

Initial set up of the sbuerk/modern-extbase-frontend-edit extension, providing the project foundation the actual implementation is built on:

  • TYPO3 v13 and v14 support on PHP 8.2 up to 8.5, with core version aware implementations below Core13/ and Core14/.
  • Dependency injection wiring through Configuration/Services.php, with services configured by Symfony dependency injection attributes on the classes themselves.
  • Container based tooling through Build/Scripts/runTests.sh covering linting, coding guidelines, static analysis, unit and functional tests and documentation rendering.
  • GitHub Actions workflows running these gates for TYPO3 v13 and v14 on pull requests.
  • A functional test setup ready to build on: strict PHPUnit configuration, fixture extensions loaded by their composer package name, site based tests issuing frontend sub-requests in several languages, and repository tests running in a built frontend environment.
  • Developer documentation below docs/, covering the architecture, the quality gates, both test suites and the release workflow.