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

src/MeWeb.Android/MainActivity.cs

@@ -0,0 +1,16 @@
+using Android.App;
+using Android.Content.PM;
+
+using Avalonia.Android;
+
+namespace MeWeb.Android;
+
+[Activity(
+    Label = "me-web?",
+    Theme = "@style/MeWebTheme.NoActionBar",
+    Icon = "@drawable/icon",
+    MainLauncher = true,
+    ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize | ConfigChanges.UiMode | ConfigChanges.Locale | ConfigChanges.LayoutDirection)]
+public class MainActivity : AvaloniaMainActivity
+{
+}