Feat: Add catalog page with category tree and product grid

- Create catalog view with recursive category tree building
- Add left-side category tree with expand/collapse functionality
- Add right-side product/kit grid with filtering and search
- Include category navigation with product/kit counts

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

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

myproject/products/views/__init__.py

@@ -95,6 +95,9 @@ from .configurablekit_views import (
 # API представления
 from .api_views import search_products_and_variants, validate_kit_cost, create_temporary_kit_api, create_tag_api
 
+# Каталог
+from .catalog_views import CatalogView
+
 
 __all__ = [
     # Утилиты
@@ -174,4 +177,7 @@ __all__ = [
     'validate_kit_cost',
     'create_temporary_kit_api',
     'create_tag_api',
+
+    # Каталог
+    'CatalogView',
 ]

myproject/products/views/catalog_views.py

@@ -0,0 +1,52 @@
+"""
+Представление для каталога товаров и комплектов.
+"""
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.views.generic import TemplateView
+
+from ..models import Product, ProductKit, ProductCategory
+
+
+class CatalogView(LoginRequiredMixin, TemplateView):
+    """Каталог с деревом категорий слева и сеткой товаров справа."""
+    template_name = 'products/catalog.html'
+
+    def build_category_tree(self, categories, parent=None):
+        """Рекурсивно строит дерево категорий с товарами."""
+        tree = []
+        for cat in categories:
+            if cat.parent_id == (parent.pk if parent else None):
+                children = self.build_category_tree(categories, cat)
+                tree.append({
+                    'category': cat,
+                    'children': children,
+                })
+        return tree
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        # Все активные категории
+        categories = list(ProductCategory.objects.filter(
+            is_active=True, is_deleted=False
+        ).prefetch_related('products', 'kits').order_by('name'))
+
+        # Строим дерево
+        category_tree = self.build_category_tree(categories, parent=None)
+
+        # Товары и комплекты для правой панели
+        products = Product.objects.filter(status='active').prefetch_related('photos').order_by('name')
+        for p in products:
+            p.item_type = 'product'
+            p.main_photo = p.photos.order_by('order').first()
+
+        kits = ProductKit.objects.filter(status='active', is_temporary=False).prefetch_related('photos').order_by('name')
+        for k in kits:
+            k.item_type = 'kit'
+            k.main_photo = k.photos.order_by('order').first()
+
+        items = sorted(list(products) + list(kits), key=lambda x: x.name)
+
+        context['category_tree'] = category_tree
+        context['items'] = items
+        return context