Update app.py

app.py

@@ -6,7 +6,7 @@ import numpy as np
 
 from quread.engine import QuantumStateVector
 from quread.exporters import to_openqasm2, to_qiskit, to_cirq
-from quread.llm_explain import explain_circuit_with_hf, ExplainConfig
+from quread.llm_explain_openai import explain_with_gpt4o
 from quread.circuit_diagram import draw_circuit_svg