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-site/backend/testapp/asgi.py

@@ -0,0 +1,14 @@
+import os
+
+import django
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "testapp.settings")
+django.setup()
+
+from django.core.asgi import get_asgi_application
+from mizan import wrap_asgi
+
+# Register server functions and channels before building the ASGI app
+import testapp.mizan_clients  # noqa: F401
+
+application = wrap_asgi(get_asgi_application())