move backend to subfolder

TanksServer/Models/Player.cs

@@ -1,16 +0,0 @@
-using System.Text.Json.Serialization;
-
-namespace TanksServer.Models;
-
-internal sealed class Player(string name, Guid id)
-{
-    public string Name => name;
-
-    [JsonIgnore] public Guid Id => id;
-
-    [JsonIgnore] public PlayerControls Controls { get; } = new();
-
-    public Scores Scores { get; } = new();
-
-    public DateTime LastInput { get; set; } = DateTime.Now;
-}