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/Models/SupportDtos.cs

@@ -0,0 +1,38 @@
+using Meezi.Core.Enums;
+
+namespace Meezi.Infrastructure.Models;
+
+public record SupportTicketDto(
+    string Id,
+    string CafeId,
+    string CafeName,
+    string Subject,
+    SupportTicketStatus Status,
+    SupportTicketPriority Priority,
+    string CreatedByEmployeeId,
+    string? CreatedByName,
+    string? AssignedAdminId,
+    DateTime CreatedAt,
+    DateTime UpdatedAt,
+    int MessageCount);
+
+public record SupportTicketDetailDto(
+    SupportTicketDto Ticket,
+    IReadOnlyList<SupportTicketMessageDto> Messages);
+
+public record SupportTicketMessageDto(
+    string Id,
+    TicketMessageSenderKind SenderKind,
+    string SenderId,
+    string? SenderName,
+    string Body,
+    DateTime CreatedAt);
+
+public record CreateSupportTicketRequest(string Subject, string Body, SupportTicketPriority? Priority);
+
+public record ReplySupportTicketRequest(string Body);
+
+public record UpdateSupportTicketRequest(
+    SupportTicketStatus? Status,
+    SupportTicketPriority? Priority,
+    string? AssignedAdminId);