Initial commit: HealthCarePregnant project documentation and platform

Co-Authored-By: Claude <noreply@anthropic.com>

pcm-platform/backend/Dockerfile

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+# PCM 后端生产镜像（多阶段构建）
+# 1) build：安装全部依赖并编译 TypeScript → dist
+# 2) runtime：仅保留生产依赖与 dist，非 root 运行
+
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+# 仅保留生产依赖，缩小运行镜像
+RUN npm prune --omit=dev
+
+FROM node:20-alpine AS runtime
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=3000
+# 拷贝生产依赖与编译产物（归属 node 用户）
+COPY --from=build --chown=node:node /app/node_modules ./node_modules
+COPY --from=build --chown=node:node /app/dist ./dist
+COPY --from=build --chown=node:node /app/package.json ./package.json
+EXPOSE 3000
+USER node
+# busybox wget 做容器健康检查（见 docker-compose.yml）
+CMD ["node", "dist/main.js"]