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

tools/ci.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -e
+. "$(dirname "$0")/sdk.sh"
+dotnet --version
+for project in src/MeWeb.Desktop/MeWeb.Desktop.csproj src/MeWeb.Server/MeWeb.Server.csproj tools/Screenshots/Screenshots.csproj; do
+  echo "== $project"
+  dotnet build "$project" -c Release -nologo -nodeReuse:false -warnaserror
+done