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.App/Services/AppSettings.cs

@@ -0,0 +1,43 @@
+using System.Text.Json;
+
+namespace MeWeb.App.Services;
+
+public class StoredSettings
+{
+  public string Language { get; set; }
+}
+
+public static class AppSettings
+{
+  static readonly string Folder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "MeWeb");
+  static readonly string FilePath = Path.Combine(Folder, "settings.json");
+
+  public static StoredSettings Read()
+  {
+    try
+    {
+      if (!File.Exists(FilePath)) return new StoredSettings();
+      using var stream = File.OpenRead(FilePath);
+      return JsonSerializer.Deserialize(stream, AppJsonContext.Default.StoredSettings) ?? new StoredSettings();
+    }
+    catch (Exception ex) when (ex is IOException or JsonException or UnauthorizedAccessException)
+    {
+      return new StoredSettings();
+    }
+  }
+
+  public static void Write(StoredSettings settings)
+  {
+    try
+    {
+      Directory.CreateDirectory(Folder);
+      var temporary = FilePath + ".tmp";
+      using (var stream = File.Create(temporary))
+        JsonSerializer.Serialize(stream, settings, AppJsonContext.Default.StoredSettings);
+      File.Move(temporary, FilePath, overwrite: true);
+    }
+    catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+    {
+    }
+  }
+}