move backend to subfolder

TanksServer/Models/PixelPosition.cs

@@ -1,17 +0,0 @@
-using System.Diagnostics;
-using TanksServer.GameLogic;
-
-namespace TanksServer.Models;
-
-[DebuggerDisplay("({X} | {Y})")]
-internal readonly struct PixelPosition(int x, int y)
-{
-    public int X { get; } = (x + MapService.PixelsPerRow) % MapService.PixelsPerRow;
-    public int Y { get; } = (y + MapService.PixelsPerColumn) % MapService.PixelsPerColumn;
-
-    public void Deconstruct(out int x, out int y)
-    {
-        x = X;
-        y = Y;
-    }
-}