build: 去除frotend docker的多阶段构建

frontend/Dockerfile.prod

@@ -1,5 +1,6 @@
 # --------------- 构建阶段 ---------------
 FROM node:22-alpine AS builder
+ENV NODE_ENV=production
 ARG PNPM_STORE_PATH=/root/.local/share/pnpm/store
 ENV BETTER_AUTH_SECRET=any-random-string-123456
 
@@ -13,15 +14,5 @@ RUN pnpm install --frozen-lockfile
 
 RUN pnpm build
 
-# --------------- 运行阶段（最小镜像） ---------------
-FROM node:22-alpine AS runner
-ENV NODE_ENV=production
-
-WORKDIR /app
-COPY --from=builder /app/next.config.js ./
-COPY --from=builder /app/.next ./.next
-COPY --from=builder /app/node_modules ./node_modules
-COPY --from=builder /app/package.json ./
-
 EXPOSE 3000
 CMD ["pnpm", "start"]