Add push notifications (Pushe) + Capacitor shell for Koja

Iran-safe push for the Koja Android app (Cafe Bazaar / Myket / direct APK):

Backend
- PushDevice entity + EF migration; idempotent device register/unregister.
- IPushSender / PusheNotificationSender (Pushe REST) — SendToTopic for
  marketing (city-{slug}) and saved-café (cafe-{slug}) pushes, SendToTokens
  for targeted order/reservation updates.
- Public register/unregister endpoints + authorized topic broadcast.

App
- capacitor.config.ts (native WebView loads the live PWA via server.url).
- push.ts Pushe glue: topic helpers + backend device registration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Meezi.Infrastructure/DependencyInjection.cs

@@ -35,6 +35,7 @@ public static class DependencyInjection
         services.AddHttpClient<ITaraPaymentGateway, TaraPaymentGateway>();
         services.AddHttpClient<ISnappfoodClient, SnappfoodClient>();
         services.AddHttpClient<ITap30Client, Tap30Client>();
+        services.AddHttpClient<IPushSender, PusheNotificationSender>();
         services.AddScoped<ITarazTaxService, TarazTaxService>();
 
         return services;