basic summaries for all pair classes, create partial classes and condense models into a single file

LightlessSync/PlayerData/Pairs/Pair.cs

@@ -14,6 +14,9 @@ using LightlessSync.WebAPI;
 
 namespace LightlessSync.PlayerData.Pairs;
 
+/// <summary>
+///     ui wrapper around a pair connection
+/// </summary>
 public class Pair
 {
     private readonly PairLedger _pairLedger;