Fix hub AI save PM2 restart NameError in hub_env_lib.

Import restart_instances_then_hub_pm2 so background restart after AI env sync actually runs on the server.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/hub_env_lib.py

@@ -11,7 +11,7 @@ from lib.env.env_file_lib import apply_env_updates, load_env_file_into_environ
 from lib.env.shared_env_lib import (
     apply_ai_env_to_all,
     build_ai_env_payload,
-    restart_hub_and_instances_pm2,
+    restart_instances_then_hub_pm2,
 )
 
 HUB_DIR = Path(__file__).resolve().parent