修改工单流程页面，订单列表增加工单按钮

OrderSupportTicket/Services/ProductImageLoader.cs

@@ -0,0 +1,35 @@
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Media;
+
+namespace OrderSupportTicket.Services;
+
+/// <summary>
+/// 商品缩略图加载器，限制并发下载数量，避免工单列表同时发起大量请求。
+/// </summary>
+internal static class ProductImageLoader
+{
+    private static readonly SemaphoreSlim Gate = new SemaphoreSlim(4, 4);
+
+    public static async Task<ImageSource> LoadAsync(string url)
+    {
+        if (string.IsNullOrWhiteSpace(url))
+            return null;
+
+        await Gate.WaitAsync().ConfigureAwait(false);
+        try
+        {
+            return await Task.Run(
+                () => AllBase.ImageBuild.LoadBitmipImageFromUrl(url.Trim()))
+                .ConfigureAwait(false);
+        }
+        catch
+        {
+            return null;
+        }
+        finally
+        {
+            Gate.Release();
+        }
+    }
+}