增加了messagebox显示的命令和功能，另外为对话暂停做了一些事件准备

Assets/Scripts/FixSystem/Screen/MessageBox.cs

@@ -0,0 +1,42 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using TMPro;
+using Yarn.Unity;
+
+public class MessageBox : MonoBehaviour
+{
+    public TMP_Text messageText; // Unity UI Text component
+
+    public void SetWarning(string message)
+    {
+        messageText.color = Color.red; // Set text color to red for warnings
+        messageText.text = message;
+    }
+
+    public void SetNormal(string message)
+    {
+        messageText.color = Color.black; // Set text color to black for normal messages
+        messageText.text = message;
+    }
+    
+    [YarnCommand("messagebox")]
+    public void HandleMessageBoxCommand(string type,string text)
+    {
+    // 根据消息类型调用相应的方法
+    if (type == "warning")
+    {
+        SetWarning(text);
+    }
+    else if (type == "normal")
+    {
+        SetNormal(text);
+    }
+    else
+    {
+        Debug.LogError("Invalid message type for messagebox command: " + type);
+    }
+
+}
+
+}