Rename all djarea references to mizan

- djarea_clients.py → clients.py (both example apps)
- export_djarea_schema → export_mizan_schema (management command)
- djarea.spec.ts → mizan.spec.ts (playwright test)
- fetch.mjs: command name updated
- apps.py/asgi.py: import paths updated
- Removed stale generated.djarea.* artifacts
- Fixed desktop app: asgi.py import, vite config aliases, package.json dep path

373 Django tests pass. Both example apps verified running.

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

examples/django-react-desktop-app/backend/asgi.py

@@ -8,6 +8,6 @@ django.setup()
 from django.core.asgi import get_asgi_application
 from mizan import wrap_asgi
 
-import backend.mizan_clients  # noqa: F401
+import backend.clients  # noqa: F401
 
 application = wrap_asgi(get_asgi_application())