Enhance backend functionality and frontend UI

- Updated main.py to include authentication for brand, model, and OTA routers.
- Added new OTA schemas in schemas.py for version management.
- Enhanced model retrieval with sorting options in models.py.
- Improved model update functionality to support multipart/form-data uploads.
- Updated frontend layout and styles for a more modern look, including new font integration.
- Implemented login route and authentication checks in router/index.js.
- Added sorting capabilities in model table and improved file handling in model view.
- Updated requirements.txt to include PyJWT for token management.

backend/routes/__init__.py

@@ -1,4 +1,5 @@
 from routes.brands import router as brands_router
 from routes.models import router as models_router
+from routes.ota import router as ota_router
 
-__all__ = ["brands_router", "models_router"]
+__all__ = ["brands_router", "models_router", "ota_router"]