멀티스레드를 이용한 병렬 처리 테스트

https://github.com/openNAMU/openNAMU/issues/1712
https://github.com/openNAMU/openNAMU/issues/1674

app.py

@@ -642,6 +642,5 @@ if __name__ == "__main__":
         app,
         host = server_set['host'],
         port = int(server_set['port']),
-        threads = 1,
         clear_untrusted_proxy_headers = True
     )