feat(ai): IAiDefinition + AiRecipeSO 配方基类（含关闭域重载的缓存重置）

Assets/_Game/Scripts/AI/AiRecipeSO.cs

@@ -0,0 +1,36 @@
+using UnityEngine;
+using BaseGames.Core.Events;
+
+namespace BaseGames.AI
+{
+    /// <summary>
+    /// AI 配方资产基类。子类以序列化字段描述一张图，Build 里组装。
+    /// 一个资产 = 一种敌人 AI；所有引用该资产的实例共享同一张 AiGraph（flyweight）。
+    /// </summary>
+    public abstract class AiRecipeSO : ScriptableObject, IAiDefinition
+    {
+        AiGraph _cached;
+
+        void OnEnable()
+        {
+            // 项目已关闭 Domain Reload：SO 的运行时态在多次 Play 会话间会残留，
+            // 改了配方再进 Play 仍用旧图。登记到统一的"进入 Play 前重置"通道。
+            PlayModeResetHook.Register(ClearCache);
+        }
+
+        void ClearCache() => _cached = null;
+
+        public AiGraph GetOrBuildGraph()
+        {
+            if (_cached == null)
+            {
+                var b = new BrainBuilder();
+                Build(b);
+                _cached = b.Build();
+            }
+            return _cached;
+        }
+
+        protected abstract void Build(BrainBuilder b);
+    }
+}

Assets/_Game/Scripts/AI/AiRecipeSO.cs.meta

@@ -0,0 +1,11 @@
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Assets/_Game/Scripts/AI/AiScript.cs

@@ -14,7 +14,7 @@ namespace BaseGames.AI
     /// 一种敌人 AI 的声明基类（唯一事实来源）。子类实现 Build 用 fluent 描述状态机。
     /// 构建结果 AiGraph 每类型只建一次、实例共享（flyweight）。
     /// </summary>
-    public abstract class AiScript
+    public abstract class AiScript : IAiDefinition
     {
         AiGraph _cached;
 

Assets/_Game/Scripts/AI/BaseGames.AI.asmdef

@@ -2,7 +2,8 @@
   "name": "BaseGames.AI",
   "rootNamespace": "BaseGames.AI",
   "references": [
-    "BaseGames.Core"
+    "BaseGames.Core",
+    "BaseGames.Core.Events"
   ],
   "includePlatforms": [],
   "excludePlatforms": [],

Assets/_Game/Scripts/AI/IAiDefinition.cs

@@ -0,0 +1,12 @@
+namespace BaseGames.AI
+{
+    /// <summary>
+    /// 能产出共享 AiGraph 的东西。两个实现：
+    /// AiScript（定制路径，写 C# 类）与 AiRecipeSO（配方路径，建资产）。
+    /// </summary>
+    public interface IAiDefinition
+    {
+        /// <summary>惰性构建并缓存共享图（flyweight：每个定义只建一次）。</summary>
+        AiGraph GetOrBuildGraph();
+    }
+}

Assets/_Game/Scripts/AI/IAiDefinition.cs.meta

@@ -0,0 +1,11 @@
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