Update for TYPO3 14.3

[BenjaminBeck]

Hi NamelessCoder,

most of this was generated with AI, mainly ChatGPT 5.5.

Regarding support for older Versions:
I suggest support for Typo3 13.4 and 14.3 - each with PHP 8.2,8.3,8.4 and 8.5
( https://typo3.com/typo3-cms/development-roadmap/roadmap )

Starting this was not really planned... my time doing this task is pretty limited.
And i am not sure how good the AI work is. But i think the nature of this project with its small logical units and the big test suite could produce good results.

Help is appreciated:

👉 Please install this PR in a Dev-Env and report what breaks

[NamelessCoder]

I appreciate the effort, but I'm sorry: there is just no way that I can adequately review a pull request that modifies more than 7,000 lines of code in 451 files and includes AI-opinionated unnecessary changes in everything from metadata over build instructions to constructors, annotation and method return types - and I'm not passing a change that I cannot review and sign-off on.

For this to be considered it has to be cut down to size with every change that isn't absolutely necessary removed. The pretty and nice to have stuff can then be considered after the important stuff.

And I would strongly discourage letting an AI attempt this, because they will start going off in all kinds of directions as soon as they hit some blocker. They are not exactly known for coming up with elegant and small compatible changes...