[cloud] fix: 云盘 PDF 预览链路修复 + 侧边目录增强 (#92) - #93
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- next.config: /minio-proxy/* beforeFiles rewrite（Next 服务端转发 nginx→MinIO）， 生产模式（NEXT_PUBLIC_API_URL 设值）也保留；MINIO_PROXY_DEST 走 build arg （rewrites 在构建时固化进 routes-manifest，运行时 env 无效） - file-viewer: presigned URL 归一化为同源相对路径，PDF 用 window.open 新标签页 交给浏览器原生查看器（原 iframe 会被 nginx X-Frame-Options SAMEORIGIN 跨源拒绝） - Dockerfile: npm registry 切 npmmirror（musl 平台 swc 二进制不在 Windows 锁文件 里，next build 现场下载直连 npmjs 必断）；healthcheck wget 改 127.0.0.1（busybox localhost 解析 IPv6，Next 只绑 IPv4，容器永远 unhealthy）
- minio.presigned_get 支持 response_headers（签名进 query）；raw 端点对 pdf/video/audio/image 注入 response-content-type=file.mime_type——对象存储为 octet-stream 且链路带 nosniff 时浏览器拒绝嗅探，iframe/媒体元素无法渲染； 对存量对象同样生效 - Dockerfile: FROM 按 digest 固定（buildkit 每次联网解析 tag 在国内网络下反复 失败，digest 可离线命中本地镜像）；pip 加 --timeout 120 --retries 5 （默认 15s，清华源下大包传输停顿即整层失败）
rewrites destination 构建时固化，MinIO 同源代理目标必须作为 build arg 传入 （http://nginx:80，走 compose 内网），运行时 environment 不生效
- hover 操作组：新建子文件夹（任意层级，内嵌输入框）/ 重命名（PATCH
/folders/{id} 前端首次接线）/ 删除（沿用确认弹窗）
- 展开/折叠状态提升到侧栏并持久化 localStorage（原来刷新后强制全展开）
- 选中深层文件夹时自动展开祖先链并 scrollIntoView（含 localStorage 恢复的
上次位置）
- 无文件夹空状态提示
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Closes #92
改动总览（4 commits，按模块拆分）
1. [frontend] PDF 同源代理 + 新标签页原生预览
frontendv2/next.config.ts：新增/minio-proxy/:path*beforeFiles rewrite（Next 服务端转发 nginx→MinIO），生产模式（NEXT_PUBLIC_API_URL设值）也保留；rewrites 在构建时固化进 routes-manifest，destination 必须走 build arg（MINIO_PROXY_DEST，运行时 env 无效——本次踩坑实证）。frontendv2/components/cloud-drive/file-viewer.tsx：presigned URL 归一化为同源相对路径（带/minio-proxy/前缀时），PDF 改为window.open新标签页交给浏览器原生查看器（带弹窗拦截兜底卡片 + 下载链接），video/audio/image 不变。frontendv2/Dockerfile：npm registry 切 npmmirror（musl swc 二进制不在 Windows 锁文件，next build 现场下载直连必断）；healthcheck 改wget 127.0.0.1（busybox localhost→IPv6 vs Next 只绑 IPv4，unhealthy 误报根因）。2. [backend] presign 注入真实 MIME + 构建加固
app/infra/minio.py：presigned_get支持response_headers（签名进 query）。app/routers/cloud.py：/raw对 pdf/video/audio/image 注入response-content-type=file.mime_type——解决 octet-stream+nosniff 拒嗅探，对存量对象同样生效。Dockerfile：FROM digest 固定（buildkit 联网解析 tag 国内反复失败，digest 离线命中本地镜像）；pip--timeout 120 --retries 5（默认 15s 清华源大包必超时）。3. [docker] compose 传
MINIO_PROXY_DESTbuild arg4. [frontend] 侧边目录增强
+，内嵌输入框）；PATCH /cloud/folders/{id}前端首次接线）；验证
tsc --noEmit+next build通过:3000同源代理 200 +Content-Type: application/pdf（211KB PDF 完整）影响范围
/raw响应结构不变（仅 URL 查询串多签名参数）MINIO__PUBLIC_ENDPOINT（非 /minio-proxy 路径时前端保持绝对 URL 不改写）