Integrate Nakama managers and enhance powerup system

Added Nakama and related manager scripts to autoload in project.godot and updated input mappings. Improved powerup_manager.gd with new methods and aliases for compatibility and gameplay rewards. Refactored ui_manager.gd to better initialize UI elements and removed unused code. Added playerboard_is_empty to player.gd for board state checks. Minor formatting changes in Nakama C# utility files for consistency.

addons/com.heroiclabs.nakama/dotnet-utils/GodotWebSocketAdapter.cs

@@ -19,23 +19,23 @@ using Godot;
 
 namespace Nakama
 {
-    /// <summary>
-    /// An exception that is thrown when the WebSocket is unable to connect.
-    /// </summary>
-    public class GodotWebSocketConnectionException : Exception {
-        public GodotWebSocketConnectionException(string message = "WebSocket unable to connect")
-            : base(message) { }
-    }
+	/// <summary>
+	/// An exception that is thrown when the WebSocket is unable to connect.
+	/// </summary>
+	public class GodotWebSocketConnectionException : Exception {
+		public GodotWebSocketConnectionException(string message = "WebSocket unable to connect")
+			: base(message) { }
+	}
 
-    /// <summary>
-    /// An exception that is thrown when the WebSocket is unable to send.
-    /// </summary>
-    public class GodotWebSocketSendException : Exception {
-        public GodotWebSocketSendException() : base("Unable to send over WebSocket") { }
-    }
+	/// <summary>
+	/// An exception that is thrown when the WebSocket is unable to send.
+	/// </summary>
+	public class GodotWebSocketSendException : Exception {
+		public GodotWebSocketSendException() : base("Unable to send over WebSocket") { }
+	}
 
-    /// <summary>
-    /// A socket adapter which uses Godot's WebSocketPeer.
+	/// <summary>
+	/// A socket adapter which uses Godot's WebSocketPeer.
     /// </summary>
     public partial class GodotWebSocketAdapter : Node, ISocketAdapter
     {