deploy: 安全部署脚本，清理实验配置由仓库脚本负责

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

deploy/safe-deploy.sh

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+#!/bin/bash
+# 安全部署：只 git pull + 更新 systemd + 重启，不手动删任何路径
+# 用法: bash deploy/safe-deploy.sh
+set -e
+DJANGO_DIR="/opt/1panel/apps/openresty/nginx/www/sites/43.142.166.152.443/django"
+cd "$DJANGO_DIR"
+
+echo ">>> git pull"
+git pull origin main
+
+echo ">>> 更新 gunicorn systemd"
+cp deploy/systemd/gunicorn-dianjing.service /etc/systemd/system/gunicorn-dianjing.service
+systemctl daemon-reload
+systemctl enable gunicorn-dianjing.service
+systemctl restart gunicorn-dianjing.service
+sleep 2
+
+echo ">>> 状态"
+systemctl is-active gunicorn-dianjing.service
+echo "gunicorn 进程: $(pgrep -cf 'gunicorn.*a_long_dianjing' || echo 0)"
+
+echo ""
+echo "部署完成。未删除任何文件。"
+echo "若需查卡顿根因（可选）: bash deploy/enable-slow-trace.sh"
+echo "查完关闭追踪:           bash deploy/disable-slow-trace.sh"