Move desktop and e2e into examples/ directory

- desktop/ → examples/django-react-desktop-app/
- e2e/ → examples/django-react-site/
- example/ → examples/django-react-site/backend/
- Update Dockerfile.test, Makefile, playwright config, and
  django.config.mjs path references

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

examples/django-react-desktop-app/tests/conftest.py

@@ -0,0 +1,8 @@
+import django
+from django.conf import settings
+
+
+# Ensure migrations run before tests
+def pytest_configure():
+    # Import mizan_clients to trigger function registration
+    import backend.mizan_clients  # noqa: F401