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/TaxesController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using Meezi.API.Models.Taxes;
 using Meezi.API.Services;
+using Meezi.Core.Authorization;
 using Meezi.Core.Interfaces;
 using Meezi.Shared;
 
@@ -29,7 +30,7 @@ public class TaxesController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
-        if (EnsureOwner(tenant) is { } ownerDenied) return ownerDenied;
+        if (EnsurePermission(tenant, Permission.CreateTax) is { } permDenied) return permDenied;
         var data = await _taxService.CreateAsync(cafeId, request, cancellationToken);
         return Ok(new ApiResponse<TaxDto>(true, data));
     }
@@ -43,7 +44,7 @@ public class TaxesController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
-        if (EnsureOwner(tenant) is { } ownerDenied) return ownerDenied;
+        if (EnsurePermission(tenant, Permission.EditTax) is { } permDenied) return permDenied;
         var data = await _taxService.UpdateAsync(cafeId, id, request, cancellationToken);
         if (data is null) return NotFoundError();
         return Ok(new ApiResponse<TaxDto>(true, data));
@@ -57,7 +58,7 @@ public class TaxesController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
-        if (EnsureOwner(tenant) is { } ownerDenied) return ownerDenied;
+        if (EnsurePermission(tenant, Permission.DeleteTax) is { } permDenied) return permDenied;
         var deleted = await _taxService.DeleteAsync(cafeId, id, cancellationToken);
         if (!deleted) return NotFoundError();
         return Ok(new ApiResponse<object>(true, new { id }));