feat: add user roles management UI with owner access control

- Added role management views (list, create, edit, delete)
- Created user_roles URL routing
- Added role management templates with Bootstrap styling
- Updated navbar with Roles link for owners and superusers
- Enhanced decorators and mixins with superuser bypass
- Added assign_owner_role.py utility script

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

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

assign_owner_role.py

@@ -0,0 +1,48 @@
+import os
+import sys
+import django
+
+# Добавляем путь к проекту
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'myproject'))
+
+# Настраиваем Django
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
+django.setup()
+
+from django.contrib.auth import get_user_model
+from django_tenants.utils import schema_context
+from user_roles.services import RoleService
+
+User = get_user_model()
+
+# Схема тенанта
+schema_name = 'buba'
+
+# Email пользователя
+user_email = 'admin@localhost'
+
+print(f"Назначение роли Owner для пользователя {user_email} в тенанте {schema_name}...")
+
+# Переключаемся на схему тенанта
+with schema_context(schema_name):
+    try:
+        # Находим пользователя
+        user = User.objects.get(email=user_email)
+        print(f"Пользователь найден: {user.email} (ID: {user.id})")
+
+        # Назначаем роль Owner
+        user_role = RoleService.assign_role_to_user(user, 'owner')
+        print(f"✓ Роль '{user_role.role.name}' успешно назначена!")
+        print(f"  - Email: {user_role.user.email}")
+        print(f"  - Имя: {user_role.user.name}")
+        print(f"  - Роль: {user_role.role.name} ({user_role.role.code})")
+        print(f"  - Активен: {user_role.is_active}")
+
+    except User.DoesNotExist:
+        print(f"✗ Ошибка: Пользователь с email '{user_email}' не найден")
+    except Exception as e:
+        print(f"✗ Ошибка при назначении роли: {e}")
+        import traceback
+        traceback.print_exc()
+
+print("\nГотово!")