Phase G: scaffold .NET 10 + SignalR backend (engine port + hub + auth)

- server/ monorepo: Hokm.Engine (C# port of TS engine+AI, validated by sim),
  Hokm.Server (SignalR GameHub, in-memory matchmaking/rooms, server-side turn
  timers + bot fill + disconnect handling, per-seat state broadcast), Hokm.Sim
- JWT dev auth (OTP 1234 + email); CORS for the Next client; /hub/game
- NuGet restored from mirrors (Soroush Nexus + Liara); NuGetAudit off
- README + .NET .gitignore; static class Engine renamed Rules (namespace clash)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/src/Hokm.Server/Properties/launchSettings.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "http://localhost:5039",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7188;http://localhost:5039",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}