Should I open a UK Ltd as EU resident?

[zerosum]

Is there official documentation mentioning this?

Citizens’ rights | European Commission

Note particularly that while building up 5 years from pre-settled status to settled status (roughly temporary vs permanent residence), you cannot be absent for more than six months in a year, or you may lose pre-settled status and all its rights, like the right to work. And it's never been clarified whether that's six months from the time of entering, the time of application, or per calendar year.
Lengthy absences from the UK can put EU settled status at risk | Free Movement

Laws are subject to interpretation, but for as long as we have the current lunatics in charge and immigration remains as controversial as it does, you can expect the Home Office here to apply the most rigorous interpretation they possibly can and spend plenty on lawyers.