diff --git a/palladium-monitor/app.py b/palladium-monitor/app.py
index e20dadd..362d76d 100644
--- a/palladium-monitor/app.py
+++ b/palladium-monitor/app.py
@@ -10,6 +10,8 @@ Palladium Z1 Monitor — LD逻辑板使用监控系统
   2. API 推送 — 在 Palladium 主机运行 collect.py 远程推送
 """
 
+from __future__ import annotations  # PEP 563: 兼容 Python 3.7+ (避免 PEP 585 泛型语法)
+
 import os
 import re
 import io
diff --git a/palladium-monitor/mailer.py b/palladium-monitor/mailer.py
index b0c7c65..f817ff1 100644
--- a/palladium-monitor/mailer.py
+++ b/palladium-monitor/mailer.py
@@ -5,6 +5,8 @@ mailer.py — Palladium Z1 每日报告邮件发送
 所有配置都从环境变量读 (生产建议用 systemd EnvironmentFile 或 .env)。
 """
 
+from __future__ import annotations  # PEP 563: 让所有 type hint 变字符串, 兼容 Python 3.7+
+
 import os
 import smtplib
 import socket