fix(editor): 修复 Aseprite JSON 尾随逗号解析问题

- 移除 AsepriteMeta 中未使用的 layers/slices 字段
- 新增 SanitizeJsonForUnity 正则清理尾随逗号
- 修复 Aseprite 导出 JSON 偶发尾随逗号导致 JsonUtility 解析失败

Assets/Editor/Window/AnimationClipData.cs

@@ -74,8 +74,6 @@ namespace AibisDream.SystemEditor
         public AsepriteSize size;
         public string scale;
         public List<AsepriteFrameTag> frameTags;
-        public List<object> layers;
-        public List<object> slices;
     }
 
     // Aseprite JSON的包装类（因为Unity JsonUtility不支持Dictionary）

Assets/Editor/Window/AnimationClipGeneratorCore.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Text.RegularExpressions;
 using UnityEditor;
 using UnityEditor.U2D.Sprites;
 using UnityEngine;
@@ -57,8 +58,7 @@ namespace AibisDream.SystemEditor
                 int metaBraceEnd = FindMatchingBrace(jsonContent, metaBraceStart);
                 string metaJson = jsonContent.Substring(metaBraceStart, metaBraceEnd - metaBraceStart + 1);
                 
-                // 移除可能的尾随逗号
-                metaJson = metaJson.TrimEnd(',', ' ', '\n', '\r');
+                metaJson = SanitizeJsonForUnity(metaJson);
                 
                 AsepriteMeta meta = JsonUtility.FromJson<AsepriteMeta>(metaJson);
 
@@ -173,7 +173,7 @@ namespace AibisDream.SystemEditor
 
                 try
                 {
-                    AsepriteFrameInfo frameInfo = JsonUtility.FromJson<AsepriteFrameInfo>(frameDataJson);
+                    AsepriteFrameInfo frameInfo = JsonUtility.FromJson<AsepriteFrameInfo>(SanitizeJsonForUnity(frameDataJson));
                     if (frameInfo.frame != null)
                     {
                         frames.Add(new FrameData
@@ -215,6 +215,14 @@ namespace AibisDream.SystemEditor
             return int.MaxValue; // 如果无法解析，放在最后
         }
 
+        /// <summary>
+        /// Unity JsonUtility 不支持尾随逗号，Aseprite 导出时偶尔会带上。
+        /// </summary>
+        private static string SanitizeJsonForUnity(string json)
+        {
+            return Regex.Replace(json, @",(\s*[}\]])", "$1");
+        }
+
         private static int FindMatchingBrace(string str, int startIndex)
         {
             if (startIndex < 0 || startIndex >= str.Length) return -1;