updated the server addredd

frontend.py

@@ -1,7 +1,7 @@
 import gradio as gr
 import requests
 
-API_URL = "http://localhost:8000"  # Replace with your FastAPI backend URL
+API_URL = "http://0.0.0.0:8000"  # URL of your FastAPI backend
 
 def sign_up(username, password):
     response = requests.post(f"{API_URL}/signup", json={"username": username, "password": password})