新增打印模板管理功能，包含免密接口和实时通知机制，支持桌面端打印模板的查询和列表展示。更新相关控制器、服务和视图，优化用户体验并增强系统的实时数据同步能力。

yy-admin-master/YY.Admin/Infrastructure/Hubs/StompWebSocketService.cs

@@ -162,6 +162,10 @@ public class StompWebSocketService : ISignalRService
                 await SendFrameAsync(
                     BuildSubscribeFrame("sub-mes-warehouse-areas", "/topic/sync/mes-warehouse-areas"),
                     cancellationToken).ConfigureAwait(false);
+                // 打印模板变更：订阅 /topic/sync/print-templates
+                await SendFrameAsync(
+                    BuildSubscribeFrame("sub-print-templates", "/topic/sync/print-templates"),
+                    cancellationToken).ConfigureAwait(false);
 
                 // 订阅服务端 PONG 回复（应用层假在线检测）
                 await SendFrameAsync(

yy-admin-master/YY.Admin/Infrastructure/Print/HtmlToPdfRenderer.cs

@@ -0,0 +1,93 @@
+using System.IO;
+using System.Text;
+using System.Windows;
+using Microsoft.Web.WebView2.Core;
+using Microsoft.Web.WebView2.Wpf;
+
+namespace YY.Admin.Infrastructure.Print;
+
+/// <summary>
+/// 使用隐藏 WebView2 窗口将 HTML 字符串渲染为 PDF base64。
+/// 所有调用必须最终在 WPF UI 线程执行，由内部 Dispatcher 保证。
+/// </summary>
+public static class HtmlToPdfRenderer
+{
+    public static Task<string> RenderAsync(string html, double widthMm = 210, double heightMm = 297)
+    {
+        var tcs = new TaskCompletionSource<string>(TaskCreationOptions.RunContinuationsAsynchronously);
+
+        Application.Current.Dispatcher.InvokeAsync(async () =>
+        {
+            try
+            {
+                var result = await RenderOnUiThreadAsync(html, widthMm, heightMm);
+                tcs.SetResult(result);
+            }
+            catch (Exception ex)
+            {
+                tcs.SetException(ex);
+            }
+        });
+
+        return tcs.Task;
+    }
+
+    private static async Task<string> RenderOnUiThreadAsync(string html, double widthMm, double heightMm)
+    {
+        var tempHtml = Path.ChangeExtension(Path.GetTempFileName(), ".html");
+        var tempPdf  = Path.ChangeExtension(Path.GetTempFileName(), ".pdf");
+        Window? win  = null;
+
+        try
+        {
+            File.WriteAllText(tempHtml, html, Encoding.UTF8);
+
+            var env = await CoreWebView2Environment.CreateAsync();
+            var wv  = new WebView2();
+
+            win = new Window
+            {
+                Width  = 1,
+                Height = 1,
+                Left   = -99999,
+                Top    = -99999,
+                ShowInTaskbar  = false,
+                WindowStyle    = WindowStyle.None,
+                Visibility     = Visibility.Visible
+            };
+            win.Content = wv;
+            win.Show();
+
+            await wv.EnsureCoreWebView2Async(env);
+
+            var navTcs = new TaskCompletionSource();
+            wv.CoreWebView2.NavigationCompleted += (_, _) => navTcs.TrySetResult();
+            wv.CoreWebView2.Navigate(new Uri(tempHtml).AbsoluteUri);
+            await navTcs.Task;
+
+            // 短暂等待 JS/CSS 完成渲染
+            await Task.Delay(200);
+
+            var settings = env.CreatePrintSettings();
+            settings.PageWidth          = widthMm / 25.4;
+            settings.PageHeight         = heightMm / 25.4;
+            settings.MarginTop          = 0;
+            settings.MarginBottom       = 0;
+            settings.MarginLeft         = 0;
+            settings.MarginRight        = 0;
+            settings.ShouldPrintHeaderAndFooter = false;
+            settings.ShouldPrintBackgrounds     = true;
+
+            await wv.CoreWebView2.PrintToPdfAsync(tempPdf, settings);
+
+            var pdfBytes = File.ReadAllBytes(tempPdf);
+            return Convert.ToBase64String(pdfBytes);
+        }
+        finally
+        {
+            win?.Close();
+            try { File.Delete(tempHtml); } catch { }
+            try { File.Delete(tempPdf);  } catch { }
+        }
+    }
+}