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/Data/DemoEmployeesCatalog.cs

@@ -0,0 +1,28 @@
+using Meezi.Core.Enums;
+
+namespace Meezi.Infrastructure.Data;
+
+/// <summary>Demo staff for development OTP login (see data/demo-credentials.json).</summary>
+public static class DemoEmployeesCatalog
+{
+    public const string DefaultBranchId = "branch_demo_main";
+
+    public sealed record EmployeeSeed(
+        string Id,
+        string Name,
+        string Phone,
+        EmployeeRole Role,
+        string BranchId = DefaultBranchId,
+        decimal BaseSalary = 0);
+
+    public static IReadOnlyList<EmployeeSeed> Employees { get; } =
+    [
+        new("emp_demo_owner", "مدیر دمو", "09121234567", EmployeeRole.Owner),
+        new("emp_demo_manager", "مدیر شعبه", "09121111111", EmployeeRole.Manager),
+        new("emp_demo_cashier", "صندوقدار", "09122222222", EmployeeRole.Cashier),
+        new("emp_demo_waiter", "گارسون", "09123333333", EmployeeRole.Waiter),
+        new("emp_demo_waiter2", "گارسون ۲", "09124444444", EmployeeRole.Waiter),
+        new("emp_demo_chef", "آشپز", "09125555555", EmployeeRole.Chef),
+        new("emp_demo_delivery", "پیک", "09126666666", EmployeeRole.Delivery),
+    ];
+}