增加检查超先行卡更新的逻辑

Assets/SibylSystem/ResourceManagers/UnityFileDownloader.cs

@@ -86,6 +86,60 @@ public class UnityFileDownloader
         }
     }
 
+    /// <summary>
+    /// 仅检查资源是否有更新，不执行下载。
+    /// 通过比较本地 ETag 和服务器 ETag 来判断。
+    /// </summary>
+    /// <param name="url">资源 URL</param>
+    /// <param name="localFilePath">本地文件路径（用于定位 .etag 文件）</param>
+    /// <param name="onComplete">回调：true = 有更新可用，false = 已是最新或检查失败</param>
+    public static IEnumerator CheckForUpdateAsync(
+        string url,
+        string localFilePath,
+        Action<bool> onComplete)
+    {
+        string etagFilePath = localFilePath + ".etag";
+        string localEtag = null;
+        bool localFileExists = File.Exists(localFilePath);
+
+        // 1. 读取本地ETag（如果存在）
+        if (File.Exists(etagFilePath))
+        {
+            try
+            {
+                localEtag = File.ReadAllText(etagFilePath);
+            }
+            catch (Exception)
+            {
+                localEtag = null; // 读取失败则当做不存在
+            }
+        }
+
+        // 2. 发送HEAD请求获取服务器ETag
+        UnityWebRequest headRequest = UnityWebRequest.Head(url);
+        headRequest.timeout = 10; // 设置较短的超时时间
+        yield return headRequest.SendWebRequest();
+
+        if (headRequest.isNetworkError || headRequest.isHttpError)
+        {
+            // 网络错误，无法判断是否有更新
+            if (onComplete != null) onComplete.Invoke(false);
+            yield break;
+        }
+
+        string serverEtag = headRequest.GetResponseHeader("ETag");
+        if (string.IsNullOrEmpty(serverEtag))
+        {
+            // 服务器未提供ETag，无法判断
+            if (onComplete != null) onComplete.Invoke(false);
+            yield break;
+        }
+
+        // 3. 比较ETag，判断是否有更新
+        bool hasUpdate = !localFileExists || string.IsNullOrEmpty(localEtag) || !localEtag.Equals(serverEtag);
+        if (onComplete != null) onComplete.Invoke(hasUpdate);
+    }
+
     /// <summary>
     /// 检查文件版本，如果不是最新则下载。
     /// 最终结果统一为成功(true)或失败(false)。

Assets/main.unity

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@@ -406,6 +524,124 @@ LightingSettings:
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