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.Server/ServerApi.cs

@@ -0,0 +1,26 @@
+using System.Net.Sockets;
+
+using MeWeb.Shared;
+
+namespace MeWeb.Server;
+
+public static class ServerApi
+{
+  public static WebApplication MapMeWebApi(this WebApplication app)
+  {
+    app.MapGet(Endpoints.Server.GET_Info, Info);
+    app.MapGet(Endpoints.Server.GET_Ip, Ip);
+    return app;
+  }
+
+  static ViewInfo Info() => new() { Version = BuildInfo.Version, Commit = BuildInfo.Commit, BuiltAt = BuildInfo.BuiltAt };
+
+  static IResult Ip(HttpContext context)
+  {
+    var address = context.Connection.RemoteIpAddress;
+    if (address is null) return Results.BadRequest();
+    if (address.IsIPv4MappedToIPv6) address = address.MapToIPv4();
+    var family = address.AddressFamily == AddressFamily.InterNetworkV6 ? "ipv6" : "ipv4";
+    return Results.Ok(new ViewIp { Address = address.ToString(), Family = family });
+  }
+}