feat: 新增 Android 移动端 head 与共享移动壳（组件面板）

LanMountainDesktop.Mobile/LanMountainDesktop.Mobile.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\LanMountainDesktop.Shared.Contracts\LanMountainDesktop.Shared.Contracts.csproj" />
+    <ProjectReference Include="..\LanMountainDesktop.Settings.Core\LanMountainDesktop.Settings.Core.csproj" />
+    <ProjectReference Include="..\LanMountainDesktop.Appearance\LanMountainDesktop.Appearance.csproj" />
+    <ProjectReference Include="..\LanMountainDesktop.DesktopComponents.Runtime\LanMountainDesktop.DesktopComponents.Runtime.csproj" />
+    <ProjectReference Include="..\LanMountainDesktop.PluginSdk\LanMountainDesktop.PluginSdk.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" />
+    <PackageReference Include="Avalonia.Themes.Fluent" />
+    <PackageReference Include="Avalonia.Fonts.Inter" />
+    <PackageReference Include="CommunityToolkit.Mvvm" />
+  </ItemGroup>
+</Project>

LanMountainDesktop.Mobile/MobileApp.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="LanMountainDesktop.Mobile.MobileApp"
+             RequestedThemeVariant="Default">
+  <Application.Styles>
+    <FluentTheme />
+  </Application.Styles>
+</Application>

LanMountainDesktop.Mobile/MobileApp.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using LanMountainDesktop.Mobile.ViewModels;
+using LanMountainDesktop.Mobile.Views;
+
+namespace LanMountainDesktop.Mobile;
+
+/// <summary>
+/// 移动端应用入口。以单视图生命周期承载组件面板。
+/// 与桌面宿主 (LanMountainDesktop.App) 共享契约、外观与组件运行时，
+/// 但不包含桌面层、托盘、进程外插件等桌面专属能力。
+/// </summary>
+public partial class MobileApp : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is ISingleViewApplicationLifetime singleView)
+        {
+            singleView.MainView = new WidgetPanelView
+            {
+                DataContext = new WidgetPanelViewModel()
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

LanMountainDesktop.Mobile/ViewModels/WidgetPanelViewModel.cs

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+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace LanMountainDesktop.Mobile.ViewModels;
+
+/// <summary>
+/// 组件面板视图模型。
+/// 移动端不提供桌面自由摆放，组件以卡片流形式呈现。
+/// 后续由组件运行时（DesktopComponents.Runtime）通过
+/// <see cref="RegisterWidget"/> 注入真实组件视图。
+/// </summary>
+public sealed partial class WidgetPanelViewModel : ObservableObject
+{
+    public ObservableCollection<WidgetCardViewModel> Widgets { get; } = [];
+
+    [ObservableProperty]
+    private string _title = "组件面板";
+
+    public WidgetPanelViewModel()
+    {
+        // 首版占位卡片：标记组件运行时的接入点。
+        Widgets.Add(new WidgetCardViewModel("时间表", "课程表 / 日程组件将在此呈现"));
+        Widgets.Add(new WidgetCardViewModel("天气", "天气组件将在此呈现"));
+        Widgets.Add(new WidgetCardViewModel("插件组件", "已安装插件提供的组件将在此呈现"));
+    }
+
+    /// <summary>
+    /// 组件运行时接入点：注册一个真实组件卡片。
+    /// </summary>
+    public void RegisterWidget(WidgetCardViewModel widget)
+    {
+        Widgets.Add(widget);
+    }
+}
+
+/// <summary>
+/// 单个组件卡片。<see cref="Content"/> 为空时显示占位说明文本，
+/// 非空时承载组件运行时提供的真实控件。
+/// </summary>
+public sealed partial class WidgetCardViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private string _name;
+
+    [ObservableProperty]
+    private string _placeholder;
+
+    [ObservableProperty]
+    private object? _content;
+
+    public WidgetCardViewModel(string name, string placeholder, object? content = null)
+    {
+        _name = name;
+        _placeholder = placeholder;
+        _content = content;
+    }
+}

LanMountainDesktop.Mobile/Views/WidgetPanelView.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:LanMountainDesktop.Mobile.ViewModels"
+             x:Class="LanMountainDesktop.Mobile.Views.WidgetPanelView"
+             x:DataType="vm:WidgetPanelViewModel">
+  <Grid RowDefinitions="Auto,*">
+    <Border Grid.Row="0" Padding="20,16">
+      <TextBlock Text="{Binding Title}"
+                 FontSize="22"
+                 FontWeight="SemiBold" />
+    </Border>
+
+    <ScrollViewer Grid.Row="1" Padding="12,0,12,12">
+      <ItemsControl ItemsSource="{Binding Widgets}">
+        <ItemsControl.ItemsPanel>
+          <ItemsPanelTemplate>
+            <StackPanel Spacing="12" />
+          </ItemsPanelTemplate>
+        </ItemsControl.ItemsPanel>
+        <ItemsControl.ItemTemplate>
+          <DataTemplate x:DataType="vm:WidgetCardViewModel">
+            <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
+                    CornerRadius="16"
+                    Padding="16"
+                    MinHeight="96">
+              <StackPanel Spacing="8">
+                <TextBlock Text="{Binding Name}"
+                           FontSize="15"
+                           FontWeight="SemiBold" />
+                <ContentControl Content="{Binding Content}"
+                                IsVisible="{Binding Content, Converter={x:Static ObjectConverters.IsNotNull}}" />
+                <TextBlock Text="{Binding Placeholder}"
+                           FontSize="13"
+                           Opacity="0.6"
+                           TextWrapping="Wrap"
+                           IsVisible="{Binding Content, Converter={x:Static ObjectConverters.IsNull}}" />
+              </StackPanel>
+            </Border>
+          </DataTemplate>
+        </ItemsControl.ItemTemplate>
+      </ItemsControl>
+    </ScrollViewer>
+  </Grid>
+</UserControl>

LanMountainDesktop.Mobile/Views/WidgetPanelView.axaml.cs

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+using Avalonia.Controls;
+
+namespace LanMountainDesktop.Mobile.Views;
+
+public partial class WidgetPanelView : UserControl
+{
+    public WidgetPanelView()
+    {
+        InitializeComponent();
+    }
+}