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/PCL.Core/Minecraft/Saves/Exceptions/SaveCorruptedException.cs

@@ -0,0 +1,30 @@
+using System;
+
+namespace PCL.Core.Minecraft.Saves.Exceptions;
+
+/// <summary>
+/// 存档损坏异常 —— level.dat 存在但无法解析或无法写入时抛出。
+/// </summary>
+public class SaveCorruptedException : Exception
+{
+    /// <summary>存档文件夹的绝对路径。</summary>
+    public string FolderPath { get; }
+
+    public SaveCorruptedException(string folderPath)
+        : base($"存档损坏：无法解析 '{folderPath}' 中的 level.dat")
+    {
+        FolderPath = folderPath;
+    }
+
+    public SaveCorruptedException(string folderPath, string message)
+        : base(message)
+    {
+        FolderPath = folderPath;
+    }
+
+    public SaveCorruptedException(string folderPath, string message, Exception inner)
+        : base(message, inner)
+    {
+        FolderPath = folderPath;
+    }
+}

launcher/PCL-CE/PCL.Core/Minecraft/Saves/Exceptions/SaveNotFoundException.cs

@@ -0,0 +1,30 @@
+using System;
+
+namespace PCL.Core.Minecraft.Saves.Exceptions;
+
+/// <summary>
+/// 存档未找到异常 —— level.dat 缺失或指定文件夹非有效存档时抛出。
+/// </summary>
+public class SaveNotFoundException : Exception
+{
+    /// <summary>存档文件夹的绝对路径。</summary>
+    public string FolderPath { get; }
+
+    public SaveNotFoundException(string folderPath)
+        : base($"未找到存档：'{folderPath}' 中缺少 level.dat")
+    {
+        FolderPath = folderPath;
+    }
+
+    public SaveNotFoundException(string folderPath, string message)
+        : base(message)
+    {
+        FolderPath = folderPath;
+    }
+
+    public SaveNotFoundException(string folderPath, string message, Exception inner)
+        : base(message, inner)
+    {
+        FolderPath = folderPath;
+    }
+}