fix: preserve cron env patch newlines

monitors/yumi/chatapp_cron_deploy.py

@@ -342,7 +342,9 @@ for key, value in updates.items():
         output.append(f"{{key}}={{json.dumps(str(value))}}")
 target.parent.mkdir(parents=True, exist_ok=True)
 with tempfile.NamedTemporaryFile("w", encoding="utf-8", dir=target.parent, delete=False) as handle:
-    handle.write("\n".join(output).rstrip() + "\n")
+    # 这段 Python 会先嵌入外层远端 shell 模板；必须保留反斜杠，避免外层
+    # f-string 把 \\n 提前展开成源码换行，导致目标机激活脚本语法错误。
+    handle.write("\\n".join(output).rstrip() + "\\n")
     temp_name = handle.name
 os.chmod(temp_name, original_mode)
 os.replace(temp_name, target)