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.API/Models/Shifts/ShiftDtos.cs

@@ -0,0 +1,33 @@
+using Meezi.Core.Enums;
+
+namespace Meezi.API.Models.Shifts;
+
+public record ShiftDto(
+    string Id,
+    string CafeId,
+    string BranchId,
+    string OpenedByUserId,
+    string? ClosedByUserId,
+    DateTime OpenedAt,
+    DateTime? ClosedAt,
+    decimal OpeningCash,
+    decimal? ClosingCash,
+    decimal ExpectedCash,
+    decimal? Discrepancy,
+    ShiftStatus Status);
+
+public record CashTransactionDto(
+    string Id,
+    string ShiftId,
+    string? BranchId,
+    CashTransactionType Type,
+    PaymentMethod Method,
+    decimal Amount,
+    string? ReferenceId,
+    string? Note,
+    string CreatedByUserId,
+    DateTime CreatedAt);
+
+public record OpenShiftRequest(decimal OpeningCash);
+
+public record CloseShiftRequest(decimal ClosingCash);