Remove direct reservation management from web interface

PROBLEM:
Direct deletion/creation of reservations via web interface bypassed
POS business logic, creating data inconsistencies (orphaned showcase kits,
incorrect stock calculations).

SOLUTION:
Make reservations read-only in web interface. All reservation management
now happens only through:
- POS (showcase kits)
- Orders module

CHANGES:
- Remove reservation-create and reservation-update URL routes
- Delete ReservationCreateView and ReservationUpdateView
- Remove ReservationForm (no longer needed)
- Delete reservation_form.html and reservation_update.html templates
- Update reservation_list.html to read-only view with info banner
- Add showcase and order columns to reservation list
- Clean up imports in urls.py and views/__init__.py

Reservations are now read-only for monitoring purposes only.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

myproject/inventory/views/reservation.py

@@ -1,46 +1,25 @@
 # -*- coding: utf-8 -*-
 """
-Reservation (Резервирование товара) views
-GROUP 2: MEDIUM PRIORITY
+Reservation (Резервирование товара) views - READ ONLY
+Резервы управляются только через POS и Orders
 """
-from django.views.generic import ListView, CreateView, UpdateView
-from django.urls import reverse_lazy
+from django.views.generic import ListView
 from django.contrib.auth.mixins import LoginRequiredMixin
-from django.contrib import messages
 from ..models import Reservation
-from ..forms import ReservationForm
 
 
 class ReservationListView(LoginRequiredMixin, ListView):
+    """
+    Список резервирований (только для просмотра).
+    Управление резервами происходит через POS (витринные комплекты) и Orders.
+    """
     model = Reservation
     template_name = 'inventory/reservation/reservation_list.html'
     context_object_name = 'reservations'
     paginate_by = 20
 
     def get_queryset(self):
+        """Показываем все резервы со статусом 'reserved'"""
         return Reservation.objects.filter(
             status='reserved'
-        ).select_related('product', 'warehouse', 'order_item').order_by('-reserved_at')
-
-
-class ReservationCreateView(LoginRequiredMixin, CreateView):
-    model = Reservation
-    form_class = ReservationForm
-    template_name = 'inventory/reservation/reservation_form.html'
-    success_url = reverse_lazy('inventory:reservation-list')
-
-    def form_valid(self, form):
-        form.instance.status = 'reserved'
-        messages.success(self.request, f'Товар успешно зарезервирован.')
-        return super().form_valid(form)
-
-
-class ReservationUpdateView(LoginRequiredMixin, UpdateView):
-    model = Reservation
-    fields = ['status']
-    template_name = 'inventory/reservation/reservation_update.html'
-    success_url = reverse_lazy('inventory:reservation-list')
-
-    def form_valid(self, form):
-        messages.success(self.request, f'Статус резервирования обновлен.')
-        return super().form_valid(form)
+        ).select_related('product', 'warehouse', 'order_item', 'showcase').order_by('-reserved_at')