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/DatabaseService.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Concurrent;
+using LiteDB;
+using PCL.Core.App.IoC;
+
+namespace PCL.Core.App.Database;
+
+[LifecycleService(LifecycleState.Loading)]
+public class DatabaseService() : GeneralService("database", "数据库管理")
+{
+    private static readonly ConcurrentDictionary<string, LiteDatabase> _Instances = new();
+
+    /// <inheritdoc />
+    public override void Stop()
+    {
+        foreach (var instance in _Instances.Values)
+        {
+            instance.Dispose();
+        }
+
+        _Instances.Clear();
+    }
+
+    /// <summary>
+    /// Get the database connenction from specified connection path.<br/>
+    /// If not exists, a new connection will be created and cached.
+    /// </summary>
+    /// <returns>Getted connenction instance.</returns>
+    /// <exception cref="ArgumentException">Throw if connection path is invalid.</exception>
+    public static LiteDatabase GetConnection(string connectionPath)
+    {
+        if (string.IsNullOrWhiteSpace(connectionPath))
+        {
+            throw new ArgumentException("Connection string canot be null or whitespace.", nameof(connectionPath));
+        }
+
+        return _Instances.GetOrAdd(connectionPath, cp => new LiteDatabase(cp));
+    }
+}