iap: wire coin packs to Cafe Bazaar SKUs + auto-select Bazaar billing in the APK

- Pack ids now equal the Bazaar/Myket SKUs (Coin5K / Coin12K / Coin28K /
  Coin65K) in both the server source-of-truth (ProfileService.Packs) and the
  mock, so the IAB credit path (Id == ProductId) grants the right coins.
  Coin totals + prices already matched the registered products.
- storeBilling.getStore(): when running inside the Capacitor Android shell and
  no explicit NEXT_PUBLIC_STORE flavor is set, default to "bazaar" so the APK
  uses Cafe Bazaar IAB (the web build stays on the ZarinPal gateway). Myket's
  native bridge still overrides when present.

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

src/lib/online/mock-service.ts

@@ -988,10 +988,11 @@ export class MockOnlineService implements OnlineService {
 
   async getCoinPacks(): Promise<CoinPack[]> {
     return [
-      { id: "p1", coins: 5000, bonus: 0, priceToman: 99000, tag: "starter" },
-      { id: "p2", coins: 11000, bonus: 1000, priceToman: 199000, tag: "popular" },
-      { id: "p3", coins: 24000, bonus: 4000, priceToman: 399000, tag: "best" },
-      { id: "p4", coins: 50000, bonus: 15000, priceToman: 799000 },
+      // id == Cafe Bazaar / Myket SKU (in-app product id).
+      { id: "Coin5K", coins: 5000, bonus: 0, priceToman: 99000, tag: "starter" },
+      { id: "Coin12K", coins: 11000, bonus: 1000, priceToman: 199000, tag: "popular" },
+      { id: "Coin28K", coins: 24000, bonus: 4000, priceToman: 399000, tag: "best" },
+      { id: "Coin65K", coins: 50000, bonus: 15000, priceToman: 799000 },
     ];
   }