Initial server source import

app/app.py

@@ -0,0 +1,13 @@
+"""Retired legacy mutation UI.
+
+Scanner lifecycle control is intentionally available only through supervisor.py.
+The read-only observability UI remains dashboard.py.
+"""
+
+import streamlit as st
+
+
+st.set_page_config(page_title='Scanner UI Retired', page_icon='LOCK', layout='centered')
+st.title('Legacy scanner controls are retired')
+st.error('This UI cannot start, pause, resume, cancel, or configure scans.')
+st.info('Use the authenticated supervisor commands for lifecycle control and dashboard.py for read-only observability.')