Refactor: reorganize scripts with domain-driven design structure

Move all C# scripts from flat structure to organized folders:
- Core/ for game logic (Game, GameState, GameSettings)
- UI/Menus/ and UI/Dialogs/ for user interface
- Systems/ for reusable systems (Save, Localization)
- Data/ for data models and configuration
- Added framework for future: Gameplay/, Story/, Modding/

Update all .tscn scene files to reference new script paths.
Fix timing issue in AdvancedSaveDialog focus handling.

scripts/UI/Menus/PauseMenu.cs

@@ -0,0 +1,84 @@
+using Godot;
+
+namespace TheGame
+{
+    public partial class PauseMenu : Control
+    {
+        private Game _gameController;
+        private Label _titleLabel;
+        private Button _resumeButton;
+        private Button _saveButton;
+        private Button _settingsButton;
+        private Button _mainMenuButton;
+        private Button _desktopButton;
+        
+        public override void _Ready()
+        {
+            // Lägg till i localized_ui gruppen
+            AddToGroup("localized_ui");
+            
+            _gameController = GetParent<Game>();
+            
+            _titleLabel = GetNode<Label>("MenuContainer/TitleLabel");
+            _resumeButton = GetNode<Button>("MenuContainer/ResumeButton");
+            _saveButton = GetNode<Button>("MenuContainer/SaveButton");
+            _settingsButton = GetNode<Button>("MenuContainer/SettingsButton");
+            _mainMenuButton = GetNode<Button>("MenuContainer/MainMenuButton");
+            _desktopButton = GetNode<Button>("MenuContainer/DesktopButton");
+            
+            UpdateLocalization();
+        }
+        
+        public void UpdateLocalization()
+        {
+            var loc = LocalizationManager.Instance;
+            _titleLabel.Text = loc.GetText("pause_menu_title");
+            _resumeButton.Text = loc.GetText("pause_menu_resume");
+            _saveButton.Text = loc.GetText("pause_menu_save");
+            _settingsButton.Text = loc.GetText("pause_menu_settings");
+            _mainMenuButton.Text = loc.GetText("pause_menu_main_menu");
+            _desktopButton.Text = loc.GetText("pause_menu_desktop");
+        }
+        
+        private void _on_resume_button_pressed()
+        {
+            _gameController.TogglePause();
+        }
+        
+        private void _on_save_button_pressed()
+        {
+            // Skapa och visa advanced save dialog
+            var advancedSaveDialog = new AdvancedSaveDialog();
+            advancedSaveDialog.ProcessMode = ProcessModeEnum.WhenPaused; // Sätt innan initialize
+            advancedSaveDialog.Initialize(_gameController);
+            GetTree().Root.AddChild(advancedSaveDialog);
+            advancedSaveDialog.PopupCentered(new Vector2I(450, 350));
+        }
+        
+        private void _on_settings_button_pressed()
+        {
+            // Skapa settings menu som popup
+            var settingsScene = GD.Load<PackedScene>("res://scenes/SettingsMenu.tscn");
+            var settingsMenu = settingsScene.Instantiate<SettingsMenu>();
+            
+            // Sätt process mode så att den fungerar när pausat
+            settingsMenu.ProcessMode = ProcessModeEnum.WhenPaused;
+            
+            GetTree().Root.AddChild(settingsMenu);
+        }
+        
+        private void _on_main_menu_button_pressed()
+        {
+            _gameController.HandleExitRequest(() => {
+                GetTree().Paused = false;
+                GameState.ResetGameState();
+                GetTree().ChangeSceneToFile("res://scenes/MainMenu.tscn");
+            });
+        }
+        
+        private void _on_desktop_button_pressed()
+        {
+            _gameController.HandleExitRequest(() => GetTree().Quit());
+        }
+    }
+}