Add start, stop, and restart helper scripts with baked-in venv checks

stop.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+import os
+import sys
+
+# Change directory to the project root
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+try:
+    import manage_webui
+except ImportError:
+    print("Error: manage_webui.py not found in the project root.", file=sys.stderr)
+    sys.exit(1)
+
+if __name__ == '__main__':
+    manage_webui.stop()