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/App/Database/DatabaseEntry.cs

@@ -0,0 +1,48 @@
+using System;
+using LiteDB;
+
+namespace PCL.Core.App.Database;
+
+/// <summary>
+/// Base database connention entry.
+/// </summary>
+public abstract class DatabaseEntry : IDisposable
+{
+    protected readonly LiteDatabase Db;
+    private bool _disposed = false;
+
+    /// <exception cref="ArgumentNullException">Throw if connection path is invalid.</exception>
+    protected DatabaseEntry(string connPath)
+    {
+        var db = DatabaseService.GetConnection(connPath);
+        Db = db ?? throw new ArgumentNullException(nameof(db), "Database variable can not be null.");
+    }
+
+    /// <exception cref="ArgumentNullException">Throw if connection path is invalid.</exception>
+    protected DatabaseEntry(LiteDatabase database)
+    {
+        Db = database ?? throw new ArgumentNullException(nameof(database), "Database variable can not be null.");
+    }
+
+    /// <inheritdoc />
+    public void Dispose()
+    {
+        Dispose(true);
+        GC.SuppressFinalize(this);
+    }
+
+    protected virtual void Dispose(bool disposing)
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        if (disposing)
+        {
+            // NOTE: do not dispose Db, because it is managed by DatabaseService
+        }
+
+        _disposed = true;
+    }
+}