feat: implement role-based permissions for product views

- Add view mixins (RoleRequiredMixin, OwnerRequiredMixin, ManagerOwnerRequiredMixin) to user_roles/mixins.py
- Replace PermissionRequiredMixin with ManagerOwnerRequiredMixin in all product views
- Remove permission_required attributes from view classes
- Owner and Manager roles now grant access without Django model permissions

This allows owners to access all product functionality through their custom role,
without needing to be superusers or have explicit Django permissions.

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

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

myproject/products/views/photo_management.py

@@ -8,7 +8,6 @@ from django.contrib import messages
 from django.http import JsonResponse
 from django.views.decorators.http import require_http_methods
 from django.contrib.auth.decorators import login_required
-from django.contrib.auth.mixins import PermissionRequiredMixin
 
 from ..models import ProductPhoto, ProductKitPhoto, ProductCategoryPhoto