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/Controllers/CafePlatformController.cs

@@ -0,0 +1,39 @@
+using Microsoft.AspNetCore.Mvc;
+using Meezi.Infrastructure.Services.Platform;
+using Meezi.Core.Interfaces;
+using Meezi.Shared;
+
+namespace Meezi.API.Controllers;
+
+[Route("api/cafes/{cafeId}/platform")]
+public class CafePlatformController : CafeApiControllerBase
+{
+    private readonly IPlatformCatalogService _catalog;
+
+    public CafePlatformController(IPlatformCatalogService catalog)
+    {
+        _catalog = catalog;
+    }
+
+    [HttpGet("features")]
+    public async Task<IActionResult> GetFeatures(string cafeId, ITenantContext tenant, CancellationToken cancellationToken)
+    {
+        if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (tenant.PlanTier is null)
+            return Ok(new ApiResponse<object>(true, new Dictionary<string, bool>()));
+
+        var features = await _catalog.GetEffectiveFeaturesForCafeAsync(
+            cafeId,
+            tenant.PlanTier.Value,
+            cancellationToken);
+
+        return Ok(new ApiResponse<object>(true, features));
+    }
+
+    [HttpGet("plans")]
+    public async Task<IActionResult> GetPublicPlans(CancellationToken cancellationToken)
+    {
+        var plans = await _catalog.GetPlansAsync(cancellationToken);
+        return Ok(new ApiResponse<object>(true, plans));
+    }
+}