Fix: Add _open() and path() methods to TenantAwareFileSystemStorage

Critical fix for Celery photo processing. The storage class now correctly
handles file reading operations by automatically adding tenant_id prefix
when opening files.

Problems fixed:
- Celery tasks could not open image files from storage
- PIL/Pillow couldn't locate files in tenant-specific directories
- temp file deletion was failing due to path validation

Changes:
- Added _open() method to add tenant_id prefix when opening files
- Added path() method to convert relative paths to full filesystem paths
- Updated delete() method to handle paths with or without tenant prefix
- All methods include security checks to prevent cross-tenant access

Testing:
- All 5 existing tests pass
- Verified photo processing task works end-to-end:
  * Reads temp image file from disk
  * Processes and creates all image versions
  * Saves processed files to tenant-specific directory
  * Cleans up temporary files correctly
- Files correctly stored in: media/tenants/{tenant_id}/products/{product_id}/{photo_id}/

🤖 Generated with Claude Code

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

myproject/pos/static/pos/js/terminal.js

@@ -98,7 +98,8 @@ function updateCustomerDisplay() {
   }
 
   // Обновляем видимость кнопок сброса (в корзине и в модалке продажи)
-  const isSystemCustomer = selectedCustomer.id === SYSTEM_CUSTOMER.id;
+  // Приводим к числу для надёжного сравнения (JSON может вернуть разные типы)
+  const isSystemCustomer = Number(selectedCustomer.id) === Number(SYSTEM_CUSTOMER.id);
 
   [document.getElementById('resetCustomerBtn'),
    document.getElementById('checkoutResetCustomerBtn')].forEach(resetBtn => {

myproject/pos/templates/pos/terminal.html

@@ -37,10 +37,10 @@
     <!-- Right Panel (4/12) - Fixed -->
     <div class="col-md-4">
       <div class="right-panel-fixed d-flex flex-column">
-        <!-- Информация о складе -->
-        {% if current_warehouse %}
+        <!-- Информация о складе (всегда показываем блок для фиксированной позиции) -->
         <div class="card mb-2">
           <div class="card-body py-2 px-3 d-flex justify-content-between align-items-center">
+            {% if current_warehouse %}
             <div>
               <small class="text-muted d-block" style="font-size: 0.75rem;">Склад:</small>
               <strong style="font-size: 0.95rem;">{{ current_warehouse.name }}</strong>
@@ -48,9 +48,14 @@
             <button class="btn btn-sm btn-outline-secondary" id="changeWarehouseBtn" style="font-size: 0.75rem;">
               <i class="bi bi-arrow-left-right"></i> Сменить
             </button>
+            {% else %}
+            <div class="text-danger">
+              <small class="d-block" style="font-size: 0.75rem;">Склад:</small>
+              <strong style="font-size: 0.95rem;"><i class="bi bi-exclamation-triangle me-1"></i>Не выбран</strong>
+            </div>
+            {% endif %}
           </div>
         </div>
-        {% endif %}
         
         <!-- Cart Panel -->
         <div class="card mb-2 flex-grow-1" style="min-height: 0;">

myproject/pos/views.py

@@ -172,15 +172,24 @@ def pos_terminal(request):
     current_warehouse = get_pos_warehouse(request)
 
     if not current_warehouse:
-        # Нет активных складов - показываем ошибку
-        from django.contrib import messages
-        messages.error(request, 'Нет активных складов. Обратитесь к администратору.')
+        # Нет активных складов - информация отображается в блоке склада в шаблоне
+        # Получаем системного клиента для корректного рендеринга JSON в шаблоне
+        system_customer, _ = Customer.get_or_create_system_customer()
         context = {
             'categories_json': json.dumps([]),
             'items_json': json.dumps([]),
             'showcase_kits_json': json.dumps([]),
             'current_warehouse': None,
             'warehouses': [],
+            'system_customer': {
+                'id': system_customer.id,
+                'name': system_customer.name
+            },
+            'selected_customer': {
+                'id': system_customer.id,
+                'name': system_customer.name
+            },
+            'cart_data': json.dumps({}),
             'title': 'POS Terminal',
         }
         return render(request, 'pos/terminal.html', context)