set TRANSLATOR_API_BASE_URL from environment

src/auracaster_webui/app.py

@@ -1,6 +1,7 @@
 """
 Airport Announcement System Streamlit frontend application.
 """
+import os
 import streamlit as st
 
 # Page setup must be first
@@ -14,6 +15,9 @@ from translator_client.translator_client import (
 )
 from translator_models.translator_models import Endpoint, EndpointGroup, AnnouncementStates
 
+if "TRANSLATOR_API_BASE_URL" not in os.environ:
+    translator_client.translator_client.API_BASE_URL = os.getenv("TRANSLATOR_API_BASE_URL")
+
 # Initialize session state for configuration
 if "endpoint_groups" not in st.session_state:
     try: