chore: 添加 Docker 部署配置

- Dockerfile: 多阶段构建（deps → build → runner）
- docker-compose.yml: 一键部署，数据持久化到 volume
- next.config.ts: output standalone 模式
- .dockerignore: 排除 node_modules、.next、dev.db

Dockerfile

@@ -0,0 +1,50 @@
+FROM node:20-alpine AS base
+
+# ── 依赖安装层 ──
+FROM base AS deps
+WORKDIR /app
+RUN corepack enable pnpm
+COPY package.json pnpm-lock.yaml ./
+COPY prisma ./prisma
+RUN pnpm install --frozen-lockfile
+RUN pnpm exec prisma generate
+
+# ── 构建层 ──
+FROM base AS builder
+WORKDIR /app
+RUN corepack enable pnpm
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN pnpm build
+
+# ── 运行层 ──
+FROM base AS runner
+WORKDIR /app
+RUN corepack enable pnpm
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# 拷贝构建产物
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+# 拷贝 prisma 和数据库
+COPY --from=builder /app/prisma ./prisma
+COPY --from=deps /app/node_modules/.prisma ./node_modules/.prisma
+COPY --from=deps /app/node_modules/@prisma ./node_modules/@prisma
+
+# 数据库持久化目录
+RUN mkdir -p /app/prisma && chown -R nextjs:nodejs /app
+
+USER nextjs
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]