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.Core/Core/Events/PrintTemplateChangedEvent.cs

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+using Prism.Events;
+
+namespace YY.Admin.Core.Events;
+
+public class PrintTemplateChangedPayload
+{
+    public string Action { get; set; } = string.Empty; // add/edit/delete/reconnect/pull
+    public string? TemplateId { get; set; }
+}
+
+public class PrintTemplateChangedEvent : PubSubEvent<PrintTemplateChangedPayload> { }

yy-admin-master/YY.Admin.Core/Core/Services/IPrintDotService.cs

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+namespace YY.Admin.Core.Services;
+
+public record PrintDotPrinter(string Name, bool IsDefault);
+
+public interface IPrintDotService
+{
+    /// <summary>获取 PrintDot 打印机列表，同时验证连通性。</summary>
+    Task<IReadOnlyList<PrintDotPrinter>> GetPrintersAsync(CancellationToken ct = default);
+
+    /// <summary>发送 PDF base64 打印任务（content 可含或不含 data:application/pdf;base64, 前缀）。</summary>
+    Task PrintAsync(string printerName, string pdfBase64, string jobName = "QH-MES", int copies = 1, CancellationToken ct = default);
+}

yy-admin-master/YY.Admin.Core/Core/Services/IPrintTemplateService.cs

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+using YY.Admin.Core.Entity;
+
+namespace YY.Admin.Core.Services;
+
+public interface IPrintTemplateService
+{
+    Task<PrintTemplate?> GetByCodeAsync(string templateCode, CancellationToken ct = default);
+    Task<IReadOnlyList<PrintTemplate>> ListAsync(CancellationToken ct = default);
+    Task<IReadOnlyList<PrintTemplate>> RefreshCacheAsync(CancellationToken ct = default);
+    IReadOnlyList<PrintTemplate> GetCached();
+}