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/Migrations/AppDbContextModelSnapshot.cs

@@ -1641,6 +1641,48 @@ namespace Meezi.Infrastructure.Data.Migrations
                     b.ToTable("PlatformSettings");
                 });
 
+            modelBuilder.Entity("Meezi.Core.Entities.PushDevice", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("text");
+
+                    b.Property<string>("City")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)");
+
+                    b.Property<string>("ConsumerAccountId")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DeletedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime>("LastSeenAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Platform")
+                        .IsRequired()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)");
+
+                    b.Property<string>("Token")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("City");
+
+                    b.HasIndex("Token")
+                        .IsUnique();
+
+                    b.ToTable("PushDevices");
+                });
+
             modelBuilder.Entity("Meezi.Core.Entities.QueueTicket", b =>
                 {
                     b.Property<string>("Id")