Enforce parameter binding requirement for ConfigurableKitProduct variants

Changes:
1. Removed unused attributesMetadata container from configurablekit_form.html
   - Dead code from old formset-based attribute system
   - 10 lines of unused HTML and templating removed

2. Enhanced formset validation in BaseConfigurableKitOptionFormSet.clean():
   - If product HAS parameters: variants MUST select values for ALL parameters
   - If product HAS NO parameters: variants MUST NOT be created
   - Error message guides user to add parameters first

Business logic:
- ConfigurableKitProduct variants (options) are ALWAYS bound to attribute values
- You cannot create orphan variants without parameter selections
- Each variant must have a value for every product parameter

User experience:
- Clear error message if trying to add variant without parameters
- Enforces proper product structure: parameters first, then variants

🤖 Generated with Claude Code

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

check_kit_bindings.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+"""
+Check existing kit bindings in database
+"""
+import os
+import sys
+import django
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
+django.setup()
+
+from products.models.kits import ConfigurableKitProduct, ConfigurableKitProductAttribute
+from django_tenants.utils import tenant_context
+from tenants.models import Client
+
+try:
+    client = Client.objects.get(schema_name='grach')
+except Client.DoesNotExist:
+    print("Tenant 'grach' not found")
+    sys.exit(1)
+
+with tenant_context(client):
+    print("=" * 80)
+    print("Current ConfigurableKitProduct items in database:")
+    print("=" * 80)
+    
+    for product in ConfigurableKitProduct.objects.all().order_by('-id')[:5]:
+        attrs_count = product.parent_attributes.count()
+        kit_bound = product.parent_attributes.filter(kit__isnull=False).count()
+        
+        print(f"\nID {product.id}: {product.name} (SKU: {product.sku})")
+        print(f"  Total attributes: {attrs_count}")
+        print(f"  Kit-bound attributes: {kit_bound}")
+        
+        if attrs_count > 0:
+            print("  Attribute breakdown:")
+            params = product.parent_attributes.values('name').distinct()
+            for param in params:
+                param_name = param['name']
+                values = product.parent_attributes.filter(name=param_name).values_list('option', 'kit__name')
+                print(f"    - {param_name}:")
+                for value, kit_name in values:
+                    kit_info = f"Kit: {kit_name}" if kit_name else "(no kit)"
+                    print(f"        * {value} -> {kit_info}")