refactor: redesign Dockerfile to fix pnpm build scripts issue

backend/Dockerfile

@@ -1,13 +1,19 @@
-
 # Stage 1: 依赖安装 + 构建
 FROM node:22-alpine AS builder
 
 WORKDIR /app
 
-COPY package.json pnpm-lock.yaml .npmrc ./
-RUN corepack enable && pnpm install --allow-build=@prisma/client --allow-build=@prisma/engines --allow-build=esbuild --allow-build=prisma
+# 允许所有包的 postinstall 脚本（Prisma/esbuild 需要）
+ENV NPM_CONFIG_IGNORE_SCRIPTS=false
 
-# Prisma 客户端生成
+# 复制依赖文件
+COPY package.json pnpm-lock.yaml ./
+COPY .npmrc ./
+
+# 安装依赖（pnpm 会读取 .npmrc 中的 onlyBuiltDependencies）
+RUN corepack enable && pnpm install --frozen-lockfile
+
+# 复制 Prisma schema 并生成客户端
 COPY prisma/ ./prisma/
 RUN npx prisma generate
 
@@ -22,14 +28,12 @@ WORKDIR /app
 ENV NODE_ENV=production
 ENV NEXT_TELEMETRY_DISABLED=1
 
-# Standalone output 包含所有必要运行时文件
+# 复制 standalone 输出和静态资源
 COPY --from=builder /app/.next/standalone ./
 COPY --from=builder /app/.next/static ./.next/static
 COPY --from=builder /app/public ./public
 COPY --from=builder /app/prisma ./prisma
-COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma
-COPY --from=builder /app/node_modules/prisma ./node_modules/prisma
 
 EXPOSE 3000
 
-CMD ["node", "server.js"]
+CMD ["node", "server.js"]