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>

server/src/Hokm.Server/Profiles/ProfileService.cs

@@ -11,10 +11,12 @@ public class ProfileService
 
     public static readonly CoinPackDto[] Packs =
     {
-        new() { Id = "p1", Coins = 5000, Bonus = 0, PriceToman = 99000, Tag = "starter" },
-        new() { Id = "p2", Coins = 11000, Bonus = 1000, PriceToman = 199000, Tag = "popular" },
-        new() { Id = "p3", Coins = 24000, Bonus = 4000, PriceToman = 399000, Tag = "best" },
-        new() { Id = "p4", Coins = 50000, Bonus = 15000, PriceToman = 799000 },
+        // Id == Cafe Bazaar / Myket SKU (in-app product id). The store is the
+        // source of truth for price; PriceToman here is only for display.
+        new() { Id = "Coin5K", Coins = 5000, Bonus = 0, PriceToman = 99000, Tag = "starter" },
+        new() { Id = "Coin12K", Coins = 11000, Bonus = 1000, PriceToman = 199000, Tag = "popular" },
+        new() { Id = "Coin28K", Coins = 24000, Bonus = 4000, PriceToman = 399000, Tag = "best" },
+        new() { Id = "Coin65K", Coins = 50000, Bonus = 15000, PriceToman = 799000 },
     };
 
     private static ProfileDto Default(string userId, string? name) => new()