Add fit/forecast model individual

main.py

@@ -431,7 +431,7 @@ async def modelfit_file_ind(
         "meanvar_test": meanvar_test,
         "signif": signif,
     }
-    return await _forward_multipart_json("/modelfit-file_ind/", files=files, data=data, user_token=user_token, method="POST")
+    return await _forward_stream("/modelfit-file_ind/", files=files, data=data, user_token=user_token, method="POST")
 
 
 @app.post("/modelforecast-file_ind/")