refactor: remove v11, promote Avalonia v12 to root, rename namespace (#20)

* feat: add Avalonia v12 rewrite (GeneralUpdate.Tools.V12)

- net10.0 + Avalonia 12.0.3 + Semi 12.0.1 + Ursa 2.0.0
- Simplified Patch: 2 folder pickers + manual fields, no csproj/update_config
- Extension package with manifest.json support
- OSS config with SHA256 + JSON export
- Semi theme (zh-CN), SideNav navigation, MVVM architecture

* fix: button-based navigation, add UseSkia for render backend

- Replace ListBox with Button-based ItemsControl for reliable page switching
- Add UseSkia() in Program.cs for Avalonia v12 rendering
- Semi theme confirmed working

* refactor: remove old v11 project, rename v12 to root

- Delete old Avalonia 11 project (src/*) and imgs/
- Move src/GeneralUpdate.Tools.V12/* → src/
- Rename namespace GeneralUpdate.Tools.V12 → GeneralUpdate.Tools
- Rename project file and solution
- Keep Semi v12 theme, net10.0, Avalonia 12.0.3

Author: JusterZhu

imgs/GeneralUpdate_h.png

@@ -1,19 +1,16 @@
-<Application xmlns="https://github.com/avaloniaui"
+<Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="GeneralUpdate.Tool.Avalonia.App"
-             xmlns:local="using:GeneralUpdate.Tool.Avalonia"
+             x:Class="GeneralUpdate.Tools.App"
+             xmlns:local="using:GeneralUpdate.Tools"
              xmlns:semi="https://irihi.tech/semi"
-             xmlns:u-semi="https://irihi.tech/ursa/themes/semi"
              RequestedThemeVariant="Default">
-    <Application.Resources>
-        <ResourceDictionary>
-            <ResourceDictionary.MergedDictionaries>
-                <ResourceInclude Source="avares://Nlnet.Avalonia.MessageBox/Assets/Themes.axaml" />
-            </ResourceDictionary.MergedDictionaries>
-        </ResourceDictionary>
-    </Application.Resources>
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+
     <Application.Styles>
-        <semi:SemiTheme Locale="en" />
-        <u-semi:SemiTheme Locale="en"/>
+        <FluentTheme />
+        <semi:SemiTheme Locale="zh-CN" />
     </Application.Styles>
-</Application>
+</Application>

src/App.axaml

@@ -1,25 +1,18 @@
-using Avalonia;
+using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
-using GeneralUpdate.Tool.Avalonia.ViewModels;
-using GeneralUpdate.Tool.Avalonia.Views;
+using GeneralUpdate.Tools.ViewModels;
+using GeneralUpdate.Tools.Views;
 
-namespace GeneralUpdate.Tool.Avalonia;
+namespace GeneralUpdate.Tools;
 
 public partial class App : Application
 {
-    public override void Initialize()
-    {
-        AvaloniaXamlLoader.Load(this);
-    }
-
+    public override void Initialize() { AvaloniaXamlLoader.Load(this); }
     public override void OnFrameworkInitializationCompleted()
     {
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
-        {
-            desktop.MainWindow = new MainWindow();
-        }
-
+            desktop.MainWindow = new MainWindow { DataContext = new MainWindowViewModel() };
         base.OnFrameworkInitializationCompleted();
     }
-}
+}