feat: Add core VN system scripts, package dependencies, and initial project settings.

Assets/_MAIN/Scripts/Core/ScriptAction.cs

@@ -0,0 +1,17 @@
+using System;
+using Cysharp.Threading.Tasks;
+
+/// <summary>컴파일된 스크립트 액션 - 실행 가능한 최소 단위</summary>
+public class ScriptAction
+{
+    /// <summary>
+    /// 실행 함수 - UniTask&lt;ScriptResult&gt; 반환
+    /// </summary>
+    public Func<ScriptContext, UniTask<ScriptResult>> Execute { get; set; }
+
+    /// <summary>디버깅용 원본 타입 (label, msg, char 등)</summary>
+    public string DebugType { get; set; }
+
+    /// <summary>디버깅용 추가 정보</summary>
+    public string DebugInfo { get; set; }
+}