Add Docker deployment as the recommended production setup.

Include Dockerfile, docker-compose on port 3130, npm mirror config, deploy scripts, and DOCKER.md; keep PM2 docs as fallback.

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

scripts/docker-deploy.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# 知命阁 Docker 部署脚本
+# 用法：cd /opt/zhimingge && bash scripts/docker-deploy.sh
+
+set -euo pipefail
+
+APP_DIR="/opt/zhimingge"
+APP_PORT="${PORT:-3130}"
+
+cd "$APP_DIR"
+
+if [[ ! -f .env.local ]]; then
+  echo "ERROR: 缺少 .env.local，请先：cp .env.example .env.local && nano .env.local"
+  exit 1
+fi
+
+echo "==> 拉取最新代码..."
+git pull origin main
+
+echo "==> 停止旧 PM2 进程（若存在）..."
+pm2 stop zhimingge 2>/dev/null || true
+pm2 delete zhimingge 2>/dev/null || true
+
+echo "==> 构建 Docker 镜像..."
+docker compose build
+
+echo "==> 启动容器..."
+docker compose up -d
+
+echo "==> 状态"
+docker compose ps
+sleep 2
+curl -s -o /dev/null -w "HTTP %{http_code}\n" "http://127.0.0.1:${APP_PORT}" || true
+
+echo "==> 部署完成。日志：docker compose logs -f zhimingge"