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/frontend/package.json

@@ -7,7 +7,7 @@
     "build": "vite build"
   },
   "dependencies": {
-    "@rythazhur/mizan": "file:../../react",
+    "@rythazhur/mizan": "file:../../../packages/mizan-react",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },