fix: [FL-126] 修复 Next.js standalone 模式下 server.js 路径问题

- 在 workspace 环境下，standalone 输出的 server.js 位于 web/ 子目录
- 修改 CMD 为 node web/server.js
- 调整 public 和 static 文件的复制路径以匹配 standalone 结构

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: multica-agent <github@multica.ai>

web/Dockerfile

@@ -34,11 +34,11 @@ ENV NEXT_PUBLIC_APP_BASE_PATH=${NEXT_PUBLIC_APP_BASE_PATH}
 RUN groupadd --system --gid 1001 nodejs && \
     useradd --system --uid 1001 --gid nodejs nextjs
 
-COPY --from=builder /app/web/public ./public
+COPY --from=builder /app/web/public ./web/public
 COPY --from=builder /app/web/.next/standalone ./
-COPY --from=builder /app/web/.next/static ./.next/static
+COPY --from=builder /app/web/.next/static ./web/.next/static
 
 USER nextjs
 
 EXPOSE 3000
-CMD ["node", "server.js"]
+CMD ["node", "web/server.js"]