feat: add web admin panel for node management

Add Flask panel with login, add/delete nodes, and share link copy.
Generate sing-box config from SQLite; add uninstall script and clean install flow.
Panel served at https://DOMAIN:8444 via nginx.

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

scripts/uninstall.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# 卸载 jiedian（sing-box + 管理面板 + nginx 站点）
+# 用法：sudo bash scripts/uninstall.sh
+set -euo pipefail
+
+[[ $EUID -eq 0 ]] || { echo "请使用 root 运行"; exit 1; }
+
+echo "[*] 停止服务 ..."
+systemctl stop jiedian-panel sing-box 2>/dev/null || true
+systemctl disable jiedian-panel sing-box 2>/dev/null || true
+
+echo "[*] 删除 systemd 单元 ..."
+rm -f /etc/systemd/system/jiedian-panel.service
+rm -f /etc/systemd/system/sing-box.service
+systemctl daemon-reload
+
+echo "[*] 删除 sing-box 配置 ..."
+rm -rf /etc/sing-box
+
+echo "[*] 删除 nginx 站点 ..."
+rm -f /etc/nginx/sites-enabled/panel
+rm -f /etc/nginx/sites-available/panel
+rm -f /etc/nginx/sites-enabled/acme
+rm -f /etc/nginx/sites-available/acme
+rm -f /etc/nginx/sites-enabled/fallback
+rm -f /etc/nginx/sites-available/fallback
+nginx -t && systemctl reload nginx 2>/dev/null || true
+
+echo "[*] 清理本地数据（保留 .env 与代码）..."
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+rm -rf "${ROOT}/data"
+rm -rf "${ROOT}/panel/venv"
+rm -rf "${ROOT}/client/generated"
+
+echo ""
+echo "卸载完成。重新安装："
+echo "  cd ${ROOT}"
+echo "  bash scripts/generate-keys.sh   # 可选，重置 Reality 密钥与面板密码"
+echo "  bash scripts/install.sh"