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>

src/components/HomeScreen.tsx

@@ -16,7 +16,8 @@ import {
 } from "lucide-react";
 import { useEffect, useState } from "react";
 import { Zap } from "lucide-react";
-import { useGameStore } from "@/lib/game-store";
+import { useGameStore, hasActiveMatch } from "@/lib/game-store";
+import { pushNotification } from "@/lib/notification-store";
 import { useSessionStore } from "@/lib/session-store";
 import { useUIStore, type Screen } from "@/lib/ui-store";
 import { useI18n } from "@/lib/i18n";
@@ -45,6 +46,20 @@ export function HomeScreen() {
   const [speed, setSpeed] = useState(false);
 
   const playVsComputer = () => {
+    // One game at a time: resume the running match instead of starting a new one.
+    if (hasActiveMatch()) {
+      useGameStore.getState().resume();
+      goGame("home");
+      pushNotification({
+        kind: "system",
+        titleFa: "بازی در جریان",
+        titleEn: "Game in progress",
+        bodyFa: "ابتدا بازی فعلی را تمام کنید یا تسلیم شوید.",
+        bodyEn: "Finish or forfeit your current game first.",
+        icon: "🎮",
+      });
+      return;
+    }
     const you = profile?.displayName || t("seat.you");
     newMatch({
       names: [you, "آرش", "کیان", "نیلوفر"],