feat(api): .NET 10 multi-tenant REST API

Full backend implementation:
- Multi-tenant cafe/restaurant management (menus, orders, tables, staff)
- POS order flow with ZarinPal and Snappfood payment integration
- OTP authentication via Kavenegar SMS
- QR digital menu with public discover/finder endpoints
- Customer loyalty, coupons, CRM
- PostgreSQL via EF Core, Redis for caching/sessions
- Background jobs, webhook handlers
- Full migration history

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/Meezi.Infrastructure/DependencyInjection.cs

@@ -0,0 +1,42 @@
+using Meezi.Core.Interfaces;
+using Meezi.Infrastructure.Data;
+using Meezi.Infrastructure.ExternalServices;
+using Meezi.Infrastructure.Services;
+using Meezi.Infrastructure.Services.Platform;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Meezi.Infrastructure;
+
+public static class DependencyInjection
+{
+    public static IServiceCollection AddInfrastructure(this IServiceCollection services, IConfiguration configuration)
+    {
+        var connectionString = configuration.GetConnectionString("DefaultConnection")
+            ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
+
+        services.AddDbContext<AppDbContext>(options =>
+            options.UseNpgsql(connectionString));
+
+        services.AddScoped<TenantContext>();
+        services.AddScoped<ITenantContext>(sp => sp.GetRequiredService<TenantContext>());
+        services.AddScoped<BranchContext>();
+        services.AddScoped<IBranchContext>(sp => sp.GetRequiredService<BranchContext>());
+        services.AddScoped<IPlatformRuntimeConfig, PlatformRuntimeConfig>();
+        services.AddMemoryCache();
+        services.AddScoped<IPlatformCatalogService, PlatformCatalogService>();
+        services.AddScoped<ISupportTicketService, SupportTicketService>();
+
+        services.AddHttpClient<ISmsService, KavenegarSmsService>();
+        services.AddHttpClient<IZarinPalGateway, ZarinPalGateway>();
+        services.AddHttpClient<ISnappPayGateway, SnappPayGateway>();
+        services.AddHttpClient<ITaraPaymentGateway, TaraPaymentGateway>();
+        services.AddHttpClient<ISnappfoodClient, SnappfoodClient>();
+        services.AddHttpClient<ITap30Client, Tap30Client>();
+        services.AddScoped<ITarazTaxService, TarazTaxService>();
+
+        return services;
+    }
+}