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.Core/Entities/Branch.cs

@@ -0,0 +1,42 @@
+namespace Meezi.Core.Entities;
+
+/// <summary>Physical branch (شعبه) under a café tenant.</summary>
+public class Branch : TenantEntity
+{
+    public string Name { get; set; } = string.Empty;
+    public string? Address { get; set; }
+    public string? City { get; set; }
+    public string? Phone { get; set; }
+    public bool IsActive { get; set; } = true;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+
+    /// <summary>When set with <see cref="BaseEntity.DeletedAt"/>, branch can be restored until this UTC time.</summary>
+    public DateTime? ScheduledPermanentDeleteAt { get; set; }
+
+    // Thermal printer (TCP ESC/POS)
+    public string? ReceiptPrinterIp { get; set; }
+    public int? ReceiptPrinterPort { get; set; }
+    public string? KitchenPrinterIp { get; set; }
+    public int? KitchenPrinterPort { get; set; }
+    public int PaperWidthMm { get; set; } = 80;
+    public bool AutoCutEnabled { get; set; } = true;
+    public string? ReceiptHeader { get; set; }
+    public string? ReceiptFooter { get; set; }
+    public string? WifiPassword { get; set; }
+    /// <summary>Branch-specific logo on QR guest menu (falls back to café logo).</summary>
+    public string? LogoUrl { get; set; }
+    public string? WelcomeText { get; set; }
+    public string? AccentColor { get; set; }
+    /// <summary>Branch tax % when café <see cref="Cafe.AllowBranchTaxOverride"/> is true.</summary>
+    public decimal? TaxRate { get; set; }
+
+    // Card POS terminal (HTTP bridge on local network)
+    public string? PosDeviceIp { get; set; }
+    public int? PosDevicePort { get; set; }
+
+    public Cafe Cafe { get; set; } = null!;
+    public ICollection<TableSection> Sections { get; set; } = [];
+    public ICollection<Table> Tables { get; set; } = [];
+    public ICollection<Order> Orders { get; set; } = [];
+    public ICollection<Employee> Staff { get; set; } = [];
+}