fix: add missing imports and routes for password setup flow

- Added get_user_model import in accounts/views.py
- Fixed User variable scope in password_setup_confirm view
- Added accounts URLs to urls_public.py for password setup on main domain
- Password setup link now accessible from public schema

Technical details:
- get_user_model() needed to be imported from django.contrib.auth
- User model reference moved outside try block to fix UnboundLocalError
- accounts.urls included in public URLconf for /accounts/setup-password/ route

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

myproject/myproject/urls_public.py

@@ -14,6 +14,7 @@ from django.conf.urls.static import static
 urlpatterns = [
     path('admin/', admin.site.urls),
     path('', include('tenants.urls')),  # Роуты для регистрации тенантов (/, /register/, /register/success/)
+    path('accounts/', include('accounts.urls')),  # Роуты для установки пароля владельцами тенантов
 ]
 
 # Serve media files in development