feat(rbac): enforce permissions on every café write endpoint

Closes the gap where the custom-role matrix was defined but unenforced — most
write endpoints only checked café membership, so the API would accept writes a
role's UI hid. Adds EnsurePermission(...) to all mutating/sensitive endpoints
across 32 controllers, mapped to the granular catalog:

- menu/inventory/coupons/customers/expenses/reservations/taxes/branches → CRUD perms
- tables/queue/kitchen-stations/print-settings → manage perms
- orders → ProcessOrders / EditOrder / VoidOrder / UpdateOrderStatus / HandlePayments,
  payment corrections → ManageFinancials
- HR → CreateStaff / ManageSchedules / ReviewLeave / View+ManageSalaries /
  ManageStaffCredentials (self-service clock-in/leave preserved)
- reports → ViewReports, export → ExportReports, audit → ViewAuditLog
- billing → ManageBilling, sms → SendSms/ManageSmsSettings, reviews → ManageReviews,
  discover/public profile → ManageDiscoverProfile, café settings → ManageCafeSettings,
  custom roles → ManageRoles

Removes legacy [Authorize(Roles=...)] attributes that would have overridden the
permission model (orders, branch-menu, pos-device, print). Manual discount/comp
have no backend endpoint yet (discounts come from coupons) — gated on the POS UI.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Meezi.API/Controllers/CustomersController.cs

@@ -2,6 +2,7 @@ using FluentValidation;
 using Microsoft.AspNetCore.Mvc;
 using Meezi.API.Models.Crm;
 using Meezi.API.Services;
+using Meezi.Core.Authorization;
 using Meezi.Core.Interfaces;
 using Meezi.Shared;
 
@@ -57,6 +58,7 @@ public class CustomersController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (EnsurePermission(tenant, Permission.CreateCustomer) is { } permDenied) return permDenied;
         var validation = await _createValidator.ValidateAsync(request, cancellationToken);
         if (!validation.IsValid) return BadRequest(ValidationError(validation));
 
@@ -77,6 +79,7 @@ public class CustomersController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (EnsurePermission(tenant, Permission.EditCustomer) is { } permDenied) return permDenied;
         var validation = await _updateValidator.ValidateAsync(request, cancellationToken);
         if (!validation.IsValid) return BadRequest(ValidationError(validation));
 
@@ -99,6 +102,7 @@ public class CustomersController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (EnsurePermission(tenant, Permission.DeleteCustomer) is { } permDenied) return permDenied;
         var deleted = await _customerService.DeleteAsync(cafeId, id, cancellationToken);
         if (!deleted) return NotFoundError();
         return Ok(new ApiResponse<object>(true, new { id }));