feat: 项目初始化 + 3D方块世界原型 + AI助搭系统

初始化 monorepo: Go后端(7微服务) + Unity客户端(9模块) + 启动器

HTML5原型: Three.js 3D体素世界, Perlin噪声地形, 原版材质, 22种方块

Minecraft创造模式背包: 双栏布局, 拖拽移动物品, 方向性元件引脚

AI助搭策划文档 + 客户端/服务端骨架 + Docker Compose + CI

launcher/PCL-CE/Plain Craft Launcher 2/Controls/Behaviors/LazyLoadBehavior.cs

@@ -0,0 +1,73 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using Microsoft.Xaml.Behaviors;
+
+namespace PCL;
+
+internal static class LazyLoader
+{
+    public static void EnableLazyLoad(this FrameworkElement element, Action action)
+    {
+        var behavior = new LazyLoadBehavior();
+        behavior.Action = action;
+        Interaction.GetBehaviors(element).Add(behavior);
+    }
+}
+
+public class LazyLoadBehavior : Behavior<FrameworkElement>
+{
+    public static readonly DependencyProperty ActionProperty = DependencyProperty.Register(nameof(Action),
+        typeof(Action), typeof(LazyLoadBehavior), new PropertyMetadata(null));
+
+    public Action Action
+    {
+        get => (Action)GetValue(ActionProperty);
+        set => SetValue(ActionProperty, value);
+    }
+
+    protected override void OnAttached()
+    {
+        base.OnAttached();
+        AssociatedObject.LayoutUpdated += OnLayoutUpdated;
+    }
+
+    protected override void OnDetaching()
+    {
+        AssociatedObject.LayoutUpdated -= OnLayoutUpdated;
+        base.OnDetaching();
+    }
+
+    private void OnLayoutUpdated(object sender, EventArgs e)
+    {
+        var element = AssociatedObject;
+        if (element is null || element.RenderSize.Width < double.Epsilon || !element.IsVisible)
+            return;
+
+        var scrollViewer = FindParentScrollViewer(element);
+        if (scrollViewer is null)
+            return;
+
+        var elementBounds = element.TransformToAncestor(scrollViewer)
+            .TransformBounds(new Rect(new Point(0d, 0d), element.RenderSize));
+        var viewport = new Rect(0d, 0d, scrollViewer.ViewportWidth, scrollViewer.ViewportHeight);
+
+        if (!viewport.IntersectsWith(elementBounds))
+            return;
+
+        Action?.Invoke();
+        // 仅执行一次
+        element.LayoutUpdated -= OnLayoutUpdated;
+    }
+
+    private static ScrollViewer FindParentScrollViewer(DependencyObject d)
+    {
+        for (var current = d; current is not null; current = VisualTreeHelper.GetParent(current))
+        {
+            if (current is ScrollViewer scrollViewer)
+                return scrollViewer;
+        }
+
+        return null;
+    }
+}