move backend to subfolder

tanks-backend/TanksServer/Models/PixelPosition.cs

@@ -0,0 +1,17 @@
+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;
+    }
+}