feat: Luban.Core初步实现，提供能力：

- RegistService 装饰器实现服务注册
- 下载服务
- 文件服务
- 多线程方法
- 解压缩服务

src/LubanHub.App/MainWindow.axaml

@@ -2,16 +2,18 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LubanHub.App.Views"
         mc:Ignorable="d" d:DesignWidth="1200" d:DesignHeight="800"
         x:Class="LubanHub.App.MainWindow"
         Title="LubanHub"
         MinWidth="1000" MinHeight="600">
     
-    <Grid>
-        <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="200"/>
-            <ColumnDefinition Width="*"/>
-        </Grid.ColumnDefinitions>
+    <Grid RowDefinitions="*,Auto">
+        <Grid Grid.Row="0">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="200"/>
+                <ColumnDefinition Width="*"/>
+            </Grid.ColumnDefinitions>
         
         <!-- 左侧导航栏 -->
         <Border Grid.Column="0" Background="{DynamicResource SidebarBackgroundBrush}" 
@@ -227,7 +229,7 @@
                                         <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
                                     <TextBox Grid.Column="0" 
-                                            Text="C:\Users\Downloads\LubanHub" 
+                                            Name="DownloadDirectoryTextBox"
                                             Background="{DynamicResource InputBackgroundBrush}"
                                             Foreground="{DynamicResource PrimaryTextBrush}"
                                             BorderBrush="{DynamicResource BorderBrush}"
@@ -235,8 +237,13 @@
                                     <Button Grid.Column="1" 
                                            Content="浏览..." 
                                            Classes="primary"
-                                           Padding="{DynamicResource ButtonPadding}"/>
+                                           Padding="{DynamicResource ButtonPadding}"
+                                           Click="OnBrowseDownloadDirectoryClick"/>
                                 </Grid>
+                                <Button Content="🧪 测试其他模块下载"
+                                       Margin="0,10,0,0"
+                                       Padding="10,5"
+                                       Click="OnTestModuleDownloadClick"/>
                             </StackPanel>
                             
                             <StackPanel>
@@ -259,5 +266,9 @@
                 </Panel>
             </Grid>
         </Border>
+        </Grid>
+        
+        <!-- 底部下载进度区域 -->
+        <views:DownloadProgressView Grid.Row="1" DataContext="{Binding DownloadProgress}" />
     </Grid>
 </Window>