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/Pages/PageDownload/Comp/PageDownloadWorld.xaml

@@ -0,0 +1,19 @@
+<local:MyPageRight
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="clr-namespace:PCL" xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d" x:Class="PCL.PageDownloadWorld"
+    PanScroll="{Binding ElementName=Content}">
+    <local:PageComp x:Name="Content" PageType="World" SupportModrinth="False">
+        <local:MyComboBoxItem Tag="" Content="{DynamicResource Common.Option.All}" IsSelected="True" />
+
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.World.Adventure}" Tag="248/" />
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.World.Creative}" Tag="249/" />
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.Modpack.MiniGame}" Tag="250/" />
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.World.Parkour}" Tag="251/" />
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.World.Puzzle}" Tag="252/" />
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.World.Survival}" Tag="253/" />
+        <local:MyComboBoxItem Content="{DynamicResource Download.Comp.Category.World.ModWorld}" Tag="4464/" />
+    </local:PageComp>
+</local:MyPageRight>