me-web? skeleton: Avalonia 12 app, server, packaging and CI

The first screen (online or not, a Check button, every language with a
draft notice), the desktop and Android heads, the server's /api/info and
/api/ip, a release tool that builds deb, rpm, a Windows exe, macOS zips,
a signed APK and the server, and the Gitea workflows that run it. Rules
adapted from passolo; AGPL-3.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

Directory.Packages.props

@@ -0,0 +1,21 @@
+<Project>
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    <AvaloniaVersion>12.1.4</AvaloniaVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageVersion Include="Avalonia" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.Themes.Fluent" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.Desktop" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.Android" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.Headless" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.Skia" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="Avalonia.HarfBuzz" Version="$(AvaloniaVersion)" />
+    <PackageVersion Include="AvaloniaUI.DiagnosticsSupport" Version="2.2.3" />
+    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.2" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.13" />
+    <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.13" />
+    <PackageVersion Include="Xamarin.AndroidX.Core.SplashScreen" Version="1.0.1.15" />
+  </ItemGroup>
+</Project>