Team hidden status is not expose from API when team is disabled

[cubercsl]

Description of the problem

When you disable a team, it will disappear from the scoreboard (both web UI and scoreboard contest API) but it still expose hidden: false in /teams Contest API.

Your environment

• DOMjudge version 9.0
• Ubuntu 24.04
• Nginx

Steps to reproduce

1. Create a contest and import data
2. Run the contest
3. Disable (disqualify) a team

Expected behaviour

The team disappears on the scoreboard, and the Contest API /teams should expose hidden: true

Actual behaviour

The Contest API /teams still expose hidden: false when the team belongs to a visible team category.

Any other information that you want to share?

https://domjudge-org.slack.com/archives/CHHURFUM7/p1763431721791879

This is a rare situation. Disabling a team will break the downstream client (ICPCTools CDS or other CLICS-compatible clients) behavior.

[vmcj]

Did you delete the team, or move it to another category?

[cubercsl]

Did you delete the team, or move it to another category?

This should be fine since the visibility of teams in the API can only be determined by category.

But since this decision was made during the contest, I only temporarily disabled the team. Afterwards, I fixed the incorrect event through the emergency entrance reserved by CDS.