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>

tests/Meezi.API.Tests/DeliveryTestDoubles.cs

@@ -0,0 +1,30 @@
+using Meezi.API.Services.Delivery;
+using Meezi.Core.Enums;
+using Meezi.Core.Interfaces;
+
+namespace Meezi.API.Tests;
+
+internal sealed class NoOpSnappfood : ISnappfoodClient
+{
+    public Task AcknowledgeOrderAsync(string snappfoodOrderId, CancellationToken cancellationToken = default) =>
+        Task.CompletedTask;
+    public Task NotifyOrderDeliveredAsync(string snappfoodOrderId, CancellationToken cancellationToken = default) =>
+        Task.CompletedTask;
+    public Task NotifyOrderStatusAsync(string snappfoodOrderId, string status, CancellationToken cancellationToken = default) =>
+        Task.CompletedTask;
+}
+
+internal sealed class NoOpDeliverySync : IDeliveryStatusSyncService
+{
+    public Task<bool> SyncInternalStatusAsync(
+        string cafeId,
+        string orderId,
+        OrderStatus newStatus,
+        CancellationToken ct = default) => Task.FromResult(false);
+
+    public Task<bool> ApplyPlatformStatusAsync(
+        DeliveryPlatform platform,
+        string externalOrderId,
+        string platformStatus,
+        CancellationToken ct = default) => Task.FromResult(false);
+}