feat: implement bot functionality with difficulty levels and integrate Polyglot opening book

modules/ui/src/main/scala/de/nowchess/ui/Main.scala

@@ -1,5 +1,7 @@
 package de.nowchess.ui
 
+import de.nowchess.api.board.Color.Black
+import de.nowchess.bot.{BotDifficulty, ClassicalBot, PolyglotBook}
 import de.nowchess.chess.engine.GameEngine
 import de.nowchess.ui.terminal.TerminalUI
 import de.nowchess.ui.gui.ChessGUILauncher
@@ -12,6 +14,11 @@ object Main:
     // Create the core game engine (single source of truth)
     val engine = new GameEngine()
 
+
+    val book = PolyglotBook("/home/janis/Workspaces/IntelliJ/NowChess/NowChessSystems/modules/bot/codekiddy.bin")
+
+    engine.setOpponentBot(ClassicalBot(BotDifficulty.Easy, book = Some(book)), Black);
+
     // Launch ScalaFX GUI in separate thread
     ChessGUILauncher.launch(engine)