v1.0.0 remote-host-agent: 机器B监控/控制轻量方案（HTTP上报+命令长轮询）

- collector.py: 机器A端 FastAPI 服务(16018)，token认证 + strict/open 命令白名单 + SQLite存储
- agent.sh: 机器B端轻量agent（仅bash+curl+base64，零安装），采集CPU/内存/磁盘/负载/开机时间 + 长轮询执行命令回传结果
- hostctl.py: 机器A端 CLI（status/hosts/run/history/commands）
- host-agent.service: 机器B端 systemd 服务
- start.sh: collector 启停脚本

host-agent.service

@@ -0,0 +1,28 @@
+# ============================================================
+# remote-host-agent 机器B端 systemd 服务
+# 部署步骤（B 端 root）:
+#   mkdir -p /opt/host-agent
+#   将 agent.sh / config.sh 放入 /opt/host-agent/
+#   cp host-agent.service /etc/systemd/system/
+#   systemctl daemon-reload
+#   systemctl enable --now host-agent
+# 常用:
+#   systemctl status host-agent
+#   journalctl -u host-agent -f
+# ============================================================
+[Unit]
+Description=Remote Host Agent (machine B -> machine A)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/host-agent
+ExecStart=/bin/bash /opt/host-agent/agent.sh
+Restart=always
+RestartSec=10
+StandardOutput=append:/var/log/host-agent.log
+StandardError=append:/var/log/host-agent.log
+
+[Install]
+WantedBy=multi-user.target