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/Entity/PrintTemplate.cs

@@ -0,0 +1,20 @@
+namespace YY.Admin.Core.Entity;
+
+/// <summary>打印模板（映射后端 print_template 表，桌面端只读）</summary>
+public class PrintTemplate
+{
+    public string? Id { get; set; }
+    public string? TemplateCode { get; set; }
+    public string? TemplateName { get; set; }
+    public string? Category { get; set; }
+    public double? PaperWidthMm { get; set; }
+    public double? PaperHeightMm { get; set; }
+    public string? PaperOrientation { get; set; }
+    /// <summary>原生设计器 JSON（engine=native）</summary>
+    public string? TemplateJson { get; set; }
+    public string? Remark { get; set; }
+    public string? CreateBy { get; set; }
+    public DateTime? CreateTime { get; set; }
+    public string? UpdateBy { get; set; }
+    public DateTime? UpdateTime { get; set; }
+}