Add stock availability display to product list and detail views

- Add total_available, total_reserved, total_free annotations to product queries
- Display free stock (green/red) with reserved count in product list
- Show detailed stock info in product detail page (moved to top)
- Make reservation count clickable to view filtered reservations
- Add product filter support to ReservationListView
- Add product link in reservation list for easy navigation

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

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

myproject/inventory/templates/inventory/reservation/reservation_list.html

@@ -7,16 +7,30 @@
 {% block inventory_content %}
 <div class="card">
   <div class="card-header d-flex justify-content-between align-items-center">
-    <h4 class="mb-0">Активные резервирования</h4>
-    <span class="badge bg-info">Только для просмотра</span>
+    <h4 class="mb-0">
+      Активные резервирования
+      {% if filtered_product %}
+        <small class="text-muted">— {{ filtered_product.name }}</small>
+      {% endif %}
+    </h4>
+    <div>
+      {% if filtered_product %}
+        <a href="{% url 'inventory:reservation-list' %}" class="btn btn-sm btn-outline-secondary me-2">
+          <i class="bi bi-x-circle"></i> Сбросить фильтр
+        </a>
+      {% endif %}
+      <span class="badge bg-info">Только для просмотра</span>
+    </div>
   </div>
 
   <div class="card-body">
+    {% if not filtered_product %}
     <div class="alert alert-info mb-3">
       <i class="bi bi-info-circle me-2"></i>
       <strong>Информация:</strong> Резервы создаются автоматически через POS (витринные комплекты) и заказы.
       Прямое управление резервами отключено для предотвращения несогласованности данных.
     </div>
+    {% endif %}
 
     {% if reservations %}
       <div class="table-responsive">
@@ -36,7 +50,9 @@
             {% for r in reservations %}
             <tr>
               <td>
-                <strong>{{ r.product.name }}</strong>
+                <a href="{% url 'products:product-detail' r.product.pk %}" class="text-decoration-none" target="_blank">
+                  <strong>{{ r.product.name }}</strong>
+                </a>
               </td>
               <td>
                 <span class="badge bg-secondary">{{ r.quantity|smart_quantity }}</span>
@@ -78,10 +94,10 @@
         <ul class="pagination justify-content-center">
           {% if page_obj.has_previous %}
             <li class="page-item">
-              <a class="page-link" href="?page=1">Первая</a>
+              <a class="page-link" href="?page=1{% if filtered_product %}&product={{ filtered_product.pk }}{% endif %}">Первая</a>
             </li>
             <li class="page-item">
-              <a class="page-link" href="?page={{ page_obj.previous_page_number }}">Предыдущая</a>
+              <a class="page-link" href="?page={{ page_obj.previous_page_number }}{% if filtered_product %}&product={{ filtered_product.pk }}{% endif %}">Предыдущая</a>
             </li>
           {% endif %}
 
@@ -93,10 +109,10 @@
 
           {% if page_obj.has_next %}
             <li class="page-item">
-              <a class="page-link" href="?page={{ page_obj.next_page_number }}">Следующая</a>
+              <a class="page-link" href="?page={{ page_obj.next_page_number }}{% if filtered_product %}&product={{ filtered_product.pk }}{% endif %}">Следующая</a>
             </li>
             <li class="page-item">
-              <a class="page-link" href="?page={{ page_obj.paginator.num_pages }}">Последняя</a>
+              <a class="page-link" href="?page={{ page_obj.paginator.num_pages }}{% if filtered_product %}&product={{ filtered_product.pk }}{% endif %}">Последняя</a>
             </li>
           {% endif %}
         </ul>

myproject/inventory/views/reservation.py

@@ -6,6 +6,7 @@ Reservation (Резервирование товара) views - READ ONLY
 from django.views.generic import ListView
 from django.contrib.auth.mixins import LoginRequiredMixin
 from ..models import Reservation
+from products.models import Product
 
 
 class ReservationListView(LoginRequiredMixin, ListView):
@@ -19,7 +20,25 @@ class ReservationListView(LoginRequiredMixin, ListView):
     paginate_by = 20
 
     def get_queryset(self):
-        """Показываем все резервы со статусом 'reserved'"""
-        return Reservation.objects.filter(
+        """Показываем все резервы со статусом 'reserved', с опциональной фильтрацией по товару"""
+        queryset = Reservation.objects.filter(
             status='reserved'
-        ).select_related('product', 'warehouse', 'order_item', 'showcase').order_by('-reserved_at')
+        ).select_related('product', 'warehouse', 'order_item', 'showcase', 'product_kit').order_by('-reserved_at')
+
+        # Фильтрация по товару
+        product_id = self.request.GET.get('product')
+        if product_id:
+            queryset = queryset.filter(product_id=product_id)
+
+        return queryset
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        # Если фильтруем по товару, добавляем его в контекст
+        product_id = self.request.GET.get('product')
+        if product_id:
+            try:
+                context['filtered_product'] = Product.objects.get(pk=product_id)
+            except Product.DoesNotExist:
+                pass
+        return context