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/Views/Print/PrintPreviewWindow.xaml

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+<hc:Window x:Class="YY.Admin.Views.Print.PrintPreviewWindow"
+           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+           xmlns:hc="https://handyorg.github.io/handycontrol"
+           xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
+           Width="1200" Height="760"
+           MinWidth="900" MinHeight="560"
+           WindowStartupLocation="CenterOwner"
+           ResizeMode="CanResize"
+           Background="White"
+           BorderBrush="#f0f0f0"
+           BorderThickness="1"
+           Title="打印预览">
+
+    <Window.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/HandyControl;component/Themes/SkinDefault.xaml"/>
+                <ResourceDictionary Source="pack://application:,,,/HandyControl;component/Themes/Theme.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Window.Resources>
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="50"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <!-- 顶部工具栏 -->
+        <Border Grid.Row="0"
+                Background="#fafafa"
+                BorderBrush="#f0f0f0"
+                BorderThickness="0,0,0,1">
+            <Grid Margin="16,0">
+                <StackPanel VerticalAlignment="Center">
+                    <TextBlock x:Name="TbTemplateName"
+                               FontSize="14" FontWeight="SemiBold"
+                               Foreground="#333333"/>
+                    <TextBlock x:Name="TbTemplateCode"
+                               FontSize="11" Foreground="#888888" Margin="0,1,0,0"/>
+                </StackPanel>
+                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"
+                            VerticalAlignment="Center">
+                    <TextBlock x:Name="TbStatus"
+                               FontSize="12" Foreground="#888888"
+                               VerticalAlignment="Center" Margin="0,0,16,0"/>
+                    <Button Content="关闭" Click="CloseButton_Click"
+                            Width="72" Height="30" FontSize="13"
+                            Style="{StaticResource ButtonDefault}"/>
+                </StackPanel>
+            </Grid>
+        </Border>
+
+        <Grid Grid.Row="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="360"/>
+                <ColumnDefinition Width="8"/>
+                <ColumnDefinition Width="*"/>
+            </Grid.ColumnDefinitions>
+
+            <!-- 左侧参数 JSON 区 -->
+            <Border Grid.Column="0"
+                    BorderBrush="#f0f0f0"
+                    BorderThickness="0,0,1,0"
+                    Background="#fafafa"
+                    Padding="10">
+                <Grid>
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto"/>
+                        <RowDefinition Height="Auto"/>
+                        <RowDefinition Height="*"/>
+                    </Grid.RowDefinitions>
+
+                    <TextBlock Text="参数JSON"
+                               FontSize="13"
+                               FontWeight="SemiBold"
+                               Foreground="#333333"/>
+
+                    <StackPanel Grid.Row="1"
+                                Orientation="Horizontal"
+                                Margin="0,8,0,8">
+                        <Button Content="根据画布生成"
+                                Click="GenerateMockJson_Click"
+                                Height="28"
+                                Padding="10,0"
+                                FontSize="12"
+                                Style="{StaticResource ButtonDefault}"/>
+                        <Button Content="重新渲染"
+                                Click="RenderByParamJson_Click"
+                                Margin="8,0,0,0"
+                                Height="28"
+                                Padding="10,0"
+                                FontSize="12"
+                                Style="{StaticResource ButtonPrimary}"/>
+                    </StackPanel>
+
+                    <TextBox x:Name="TbParamJson"
+                             Grid.Row="2"
+                             AcceptsReturn="True"
+                             AcceptsTab="True"
+                             VerticalScrollBarVisibility="Auto"
+                             HorizontalScrollBarVisibility="Auto"
+                             FontFamily="Consolas"
+                             FontSize="12"
+                             TextWrapping="NoWrap"
+                             BorderBrush="#d9d9d9"
+                             BorderThickness="1"/>
+                </Grid>
+            </Border>
+
+            <GridSplitter Grid.Column="1"
+                          Width="8"
+                          HorizontalAlignment="Stretch"
+                          VerticalAlignment="Stretch"
+                          ResizeBehavior="PreviousAndNext"
+                          ShowsPreview="True"
+                          Background="#f0f0f0"
+                          Cursor="SizeWE"/>
+
+            <!-- 右侧 WebView2 预览区 -->
+            <wv2:WebView2 Grid.Column="2" x:Name="WebView" DefaultBackgroundColor="Transparent"/>
+        </Grid>
+    </Grid>
+</hc:Window>