chore: initial commit

Assets/Scripts/Core/Events/GameStateId.cs

@@ -0,0 +1,21 @@
+namespace BaseGames.Core.Events
+{
+    /// <summary>
+    /// 游戏状态 ID（值类型，替代旧版 GameState 枚举）。
+    /// 具体实例由 GameStates 静态工厂创建。
+    /// </summary>
+    public readonly struct GameStateId : System.IEquatable<GameStateId>
+    {
+        public readonly string Id;
+
+        public GameStateId(string id) => Id = id;
+
+        public bool Equals(GameStateId other) => Id == other.Id;
+        public override bool Equals(object obj) => obj is GameStateId g && Equals(g);
+        public override int GetHashCode() => Id?.GetHashCode() ?? 0;
+        public override string ToString() => Id ?? "<null>";
+
+        public static bool operator ==(GameStateId a, GameStateId b) => a.Equals(b);
+        public static bool operator !=(GameStateId a, GameStateId b) => !a.Equals(b);
+    }
+}