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/README.md

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+# Database Guildline
+This is a light database management guildline for PCL.Core. It is not a strict rule, but a recommendation to follow.
+## How to create a new database
+1. You need create a class that inheritance from `DatabaseEntry`.
+2. Then make a ctor that call `base(<connPath>)` with the connection path.
+3. Now this class is ready to use. (Yes it is that simple, and will automatically create the database file if not exists)
+
+## DatabaseEntry
+The `DatabaseEntry` class is the entrance to use the database.
+User must implement a class that inheritance from `DatabaseEntry` to use it.
+And the child class should implement there own method to provide some ways to interact with the database.
+
+## A Normal Example
+```charp
+public class UserDatabase : DatabaseEntry
+{
+	public UserDatabase() : base("example.db")
+	{
+		// You can do some initialization here.
+		// Like create table if not exists,
+		// or anything else.
+	}
+
+
+	public List<(int Id, string Name, int Age)> GetAllUsers()
+	{
+		// In your method, you shoul provide some way to interact with the database.
+	}
+}
+```
+Then, you can use it like this:
+```charp
+var db = new UserDatabase();
+var users = db.GetAlUsers();
+```