Unique Affiliation Filter

[isaaclo97]

Description of the enhancement request

Implement a "Unique Affiliation" filter on Scoreboard pages. This filter must display only the highest-ranked team from each unique institution/affiliation.

The goal you want to achieve

The primary goal is to easily and accurately determine the list of teams eligible for advancement. This is necessary because many contests, including ICPC regionals, follow the rule that only one team per institution can qualify, regardless of how many teams from that institution finish high on the overall scoreboard. This filter provides a fast, official view of the true advancing teams.

Expected behaviour

1. A new filter/view option, such as "Unique Affiliation" or "Eligible for Advancement", is added to the Scoreboard interface (both public and jury).
2. When this filter is activated, the system applies a classification rule: it iterates through the currently ranked teams and hides/excludes all teams except the highest-ranked team belonging to each institution.
3. The resulting scoreboard view shows only the single best-performing team for every distinct affiliation, respecting the one-team-per-institution rule.

[nickygerritsen]

I think we need a different name for the filter, but not sure what's better. I do like the idea, but we should make it an option somehow (so we don't clutter scoreboards that don't need it).