Paper based fallbacks

### Enhancement Type

Improve an existing feature

### Describe the enhancement

When it detects a server like pufferfish and the plugins added from modrinth for example when I try to install Custom f3 Brand and I am on 1.21.11 and pufferfish fall back to paper if a version isn’t available for the specific type and if there is no paper fall back to spigot as allow setting up a plugin made for 1.21.10 on 1.21.11

Start by locating the existing server and plugin version-selection logic, including how Modrinth plugins are matched to server types and versions. Implement the requested fallback order from Pufferfish to Paper to Spigot, then validate it with the Custom F3 Brand and 1.21.10/1.21.11 scenario described in the issue.

Written by the indexing model from the issue text.