Prod hardening: one-game-per-player, selectable music, bargevasat.ir config

- One running game per player: server rejects a 2nd matchmake while in a live
  room (re-syncs the existing game); client guards Home vs-computer + Lobby
  random/create — resumes the running match + notifies instead of starting another
  (game-store hasActiveMatch()).
- Background music is now selectable: santoor (سنتی, calm Persian loop) and
  playful (bouncy UNO-like) — sound.ts TRACKS + setMusicTrack (persisted),
  sound-store musicTrack, picker in Profile → Audio. i18n added.
- Production config for bargevasat.ir (prepare-only; no live deploy):
  appsettings.Production.example (CORS + ZarinPal + IAB to the domain),
  docker-compose.caddy.yml + Caddyfile (auto-HTTPS reverse proxy
  bargevasat.ir→web, api.bargevasat.ir→server), ENV_FILE PRODUCTION block,
  PRODUCTION.md go-live + Cafe Bazaar publish/IAB checklist. Fixed IAB package
  name to match Capacitor appId (com.bargevasat.app).

Verified: tsc + next build + dotnet build all pass.

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

server/src/Hokm.Server/Game/GameManager.cs

@@ -47,6 +47,14 @@ public sealed class GameManager
 
     public void StartMatchmaking(Player p)
     {
+        // One running game per player: if already in a live match, re-sync them to
+        // it (re-broadcasts current state) instead of starting a second game.
+        if (RoomOf(p.UserId) is { } existing)
+        {
+            existing.SetConnected(p.UserId, true);
+            return;
+        }
+
         // Pro players skip the queue entirely.
         if (p.Plan == "pro")
         {