implement different kinds of power ups (two bullet types not implemented yet)

tanks-backend/TanksServer/Models/IMapEntity.cs

@@ -2,7 +2,7 @@ namespace TanksServer.Models;
 
 internal interface IMapEntity
 {
-    FloatPosition Position { get; set; }
+    FloatPosition Position { get; }
 
     PixelBounds Bounds { get; }
 }

tanks-backend/TanksServer/Models/PowerUp.cs

@@ -2,9 +2,19 @@ using TanksServer.GameLogic;
 
 namespace TanksServer.Models;
 
-internal sealed class PowerUp(FloatPosition position): IMapEntity
+internal enum PowerUpType
 {
-    public FloatPosition Position { get; set; } = position;
+    MagazineTypeUpgrade,
+    MagazineSizeUpgrade
+}
+
+internal sealed class PowerUp: IMapEntity
+{
+    public required FloatPosition Position { get; init; }
 
     public PixelBounds Bounds => Position.GetBoundsForCenter(MapService.TileSize);
+
+    public required PowerUpType Type { get; init; }
+
+    public MagazineType? MagazineType { get; init; }
 }