add http callback server when running in stdio with transport aware startup

auth/google_auth.py

@@ -486,14 +486,19 @@ async def get_authenticated_google_service(
         )
 
         # Import here to avoid circular import
-        from core.server import OAUTH_REDIRECT_URI
+        from core.server import get_oauth_redirect_uri_for_current_mode
+        from auth.oauth_callback_server import ensure_oauth_callback_available
 
+        # Ensure OAuth callback is available 
+        redirect_uri = get_oauth_redirect_uri_for_current_mode()
+        # Note: We don't know the transport mode here, but the server should have set it
+        
         # Generate auth URL and raise exception with it
         auth_response = await start_auth_flow(
             mcp_session_id=None,  # No longer using session-based auth
             user_google_email=user_google_email,
             service_name=f"Google {service_name.title()}",
-            redirect_uri=OAUTH_REDIRECT_URI,
+            redirect_uri=redirect_uri,
         )
         
         # Extract the auth URL from the response and raise with it