add lineup manager

GameServer/Game/Lineup/LineupManager.cs

@@ -0,0 +1,29 @@
+using MikuSB.Database;
+using MikuSB.GameServer.Game.Player;
+using MikuSB.Database.Lineup;
+
+namespace MikuSB.GameServer.Game.Lineup;
+
+public class LineupManager(PlayerInstance player) : BasePlayerManager(player)
+{
+    public LineupData LineupData { get; } = DatabaseHelper.GetInstanceOrCreateNew<LineupData>(player.Uid);
+
+    public async ValueTask<LineupDataInfo?> UpdateLineup(int lineupId, uint member1, uint member2, uint member3)
+    {
+        if (!LineupData.LineupInfo.TryGetValue(lineupId, out var formation))
+        {
+            formation = new LineupDataInfo
+            {
+                Index = (uint)lineupId,
+                Name = lineupId.ToString()
+            };
+
+            LineupData.LineupInfo[lineupId] = formation;
+        }
+
+        formation.Member1 = member1;
+        formation.Member2 = member2;
+        formation.Member3 = member3;
+        return formation;
+    }
+}