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/Data/AppDbContext.cs

@@ -60,10 +60,25 @@ public class AppDbContext : DbContext
     public DbSet<WebsiteComment> WebsiteComments => Set<WebsiteComment>();
     public DbSet<DemoRequest> DemoRequests => Set<DemoRequest>();
 
+    // Push notifications (Pushe)
+    public DbSet<PushDevice> PushDevices => Set<PushDevice>();
+
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         base.OnModelCreating(modelBuilder);
 
+        modelBuilder.Entity<PushDevice>(e =>
+        {
+            e.HasKey(x => x.Id);
+            e.HasIndex(x => x.Token).IsUnique();
+            e.HasIndex(x => x.City);
+            e.Property(x => x.Token).HasMaxLength(256).IsRequired();
+            e.Property(x => x.Platform).HasMaxLength(20).IsRequired();
+            e.Property(x => x.City).HasMaxLength(100);
+            e.Property(x => x.ConsumerAccountId).HasMaxLength(64);
+            e.HasQueryFilter(x => x.DeletedAt == null);
+        });
+
         modelBuilder.Entity<Cafe>(e =>
         {
             e.HasKey(x => x.Id);