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>

Dockerfile

@@ -0,0 +1,38 @@
+# 知命阁（zhimingge）— Next.js standalone 生产镜像
+FROM node:20-alpine AS base
+RUN apk add --no-cache libc6-compat
+
+FROM base AS deps
+WORKDIR /app
+COPY package.json package-lock.json .npmrc ./
+RUN npm ci
+
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+FROM base AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3130
+ENV HOSTNAME=0.0.0.0
+
+RUN addgroup --system --gid 1001 nodejs \
+  && adduser --system --uid 1001 nextjs
+
+# standalone 产物
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+# 卦辞 Markdown（运行时读取）
+COPY --from=builder /app/content ./content
+
+RUN mkdir -p public && chown -R nextjs:nodejs /app
+
+USER nextjs
+EXPOSE 3130
+
+CMD ["node", "server.js"]