fix: 支持备份恢复与站点同步的大文件上传 版本更新到1.5.4

- 备份恢复的 multipart 分支改用 Web FormData，移除旧解析器约 128 MB 的限制
- 初始化恢复新增 application/octet-stream 流式写盘，前端改为直接上传文件流，避免整包进入内存
- 站点同步改用 Web FormData，并在读取请求体前拒绝超过 500 MB 的文件
- 新增 multipart 字段、重复字段和文件读取回归测试

验证：
- 2 GB 测试备份包流式恢复预览成功，服务内存保持低位
- 130 MB 站点同步上传成功
- 原有备份预览及图片、视频、文件上传正常
- npm test 234 项通过；npm run typecheck 与 eslint 通过

server/api/admin/backup/restore.post.ts

@@ -1,4 +1,4 @@
-import type { H3Event } from 'h3'
+import { readFormData, type H3Event } from 'h3'
 import { requireAdminAuth } from '../../../utils/access'
 import { createApiError } from '../../../utils/api-error'
 import { serializeBackupJob } from '../../../utils/backup/api'
@@ -14,6 +14,7 @@ import {
 import { createWriteStream, promises as fs } from 'node:fs'
 import { basename, dirname, join } from 'node:path'
 import { pipeline } from 'node:stream/promises'
+import { readFormDataFiles } from '../../../utils/multipart-form'
 
 interface RestoreBody {
   archiveName?: string
@@ -75,21 +76,22 @@ async function resolveRestoreInput(event: H3Event, userId: number): Promise<{
   }
 
   if (contentType.includes('multipart/form-data')) {
-    const form = await readMultipartFormData(event)
-    const filePart = form?.find(part => part.name === 'file' && part.data?.length)
-    if (!filePart?.data) {
+    const form = await readFormData(event)
+    const filePart = readFormDataFiles(form, ['file'])[0]
+    if (!filePart) {
       createApiError(event, 'INVALID_REQUEST', '请上传备份文件', 400)
     }
 
-    const conflictField = form?.find(part => part.name === 'conflictMode')?.data?.toString('utf8')
-    const dryRunField = form?.find(part => part.name === 'dryRun')?.data?.toString('utf8')
+    const conflictField = form.get('conflictMode')
+    const dryRunField = form.get('dryRun')
     const dryRun = dryRunField === 'true'
+    const fileBytes = new Uint8Array(await filePart.arrayBuffer())
 
     if (dryRun) {
       const tempDir = getBackupStagingDir(`upload-preview-${Date.now()}`)
       await fs.mkdir(tempDir, { recursive: true })
       const archivePath = join(tempDir, 'package.phost.tar.gz')
-      await fs.writeFile(archivePath, filePart.data)
+      await fs.writeFile(archivePath, fileBytes)
       return {
         archivePath,
         body: {
@@ -105,7 +107,7 @@ async function resolveRestoreInput(event: H3Event, userId: number): Promise<{
     await fs.mkdir(getBackupsDir(), { recursive: true })
     const safeName = `upload-${Date.now()}${BACKUP_ARCHIVE_EXT}`
     const archivePath = join(getBackupsDir(), safeName)
-    await fs.writeFile(archivePath, filePart.data)
+    await fs.writeFile(archivePath, fileBytes)
     return {
       archivePath,
       body: {

server/api/setup/restore.post.ts

@@ -1,25 +1,45 @@
+import { getHeader, readFormData, type H3Event } from 'h3'
 import { createApiError } from '../../utils/api-error'
 import { isInitialized } from '../../utils/auth'
 import { serializeBackupJob } from '../../utils/backup/api'
 import { startFullRestoreJob } from '../../utils/backup/runner'
 import { BACKUP_ARCHIVE_EXT, getBackupsDir } from '../../utils/backup/paths'
+import { readFormDataFiles } from '../../utils/multipart-form'
 import { join } from 'node:path'
-import { promises as fs } from 'node:fs'
+import { createWriteStream, promises as fs } from 'node:fs'
+import { pipeline } from 'node:stream/promises'
+
+async function saveRestoreUpload(event: H3Event, archivePath: string): Promise<void> {
+  const contentType = getHeader(event, 'content-type') ?? ''
+  try {
+    if (contentType.includes('application/octet-stream')) {
+      await pipeline(event.node.req, createWriteStream(archivePath))
+    } else {
+      const form = await readFormData(event)
+      const file = readFormDataFiles(form, ['file'])[0]
+      if (!file) {
+        createApiError(event, 'INVALID_REQUEST', '请上传备份文件', 400)
+      }
+      await fs.writeFile(archivePath, new Uint8Array(await file.arrayBuffer()))
+    }
+    const stat = await fs.stat(archivePath)
+    if (stat.size === 0) {
+      createApiError(event, 'INVALID_REQUEST', '备份文件为空', 400)
+    }
+  } catch (error) {
+    await fs.rm(archivePath, { force: true }).catch(() => {})
+    throw error
+  }
+}
 
 export default defineEventHandler(async (event) => {
   if (isInitialized()) {
     createApiError(event, 'FORBIDDEN', '系统已初始化，请在存储页恢复备份', 403)
   }
 
-  const form = await readMultipartFormData(event)
-  const filePart = form?.find(part => part.name === 'file' && part.data?.length)
-  if (!filePart?.data) {
-    createApiError(event, 'INVALID_REQUEST', '请上传备份文件', 400)
-  }
-
   await fs.mkdir(getBackupsDir(), { recursive: true })
   const archivePath = join(getBackupsDir(), `setup-restore-${Date.now()}${BACKUP_ARCHIVE_EXT}`)
-  await fs.writeFile(archivePath, filePart.data)
+  await saveRestoreUpload(event, archivePath)
 
   try {
     const job = startFullRestoreJob(archivePath, 'overwrite')

server/api/site-sync/object.post.ts

@@ -1,4 +1,4 @@
-import { readMultipartFormData } from 'h3'
+import { getHeader, readFormData } from 'h3'
 import { requireSiteSyncAuth } from '../../utils/access'
 import { createApiError } from '../../utils/api-error'
 import { MAX_VIDEO_FILE_SIZE } from '../../utils/constants'
@@ -6,23 +6,27 @@ import { findUserByUsername } from '../../utils/db'
 import { validateStorageKey } from '../../utils/image-key'
 import { getActiveBackend } from '../../utils/storage/resolver'
 import { recordSiteSyncArtifact } from '../../utils/site-sync/artifacts'
+import { readFormDataFiles } from '../../utils/multipart-form'
 
-function field(form: Awaited<ReturnType<typeof readMultipartFormData>>, name: string): string {
-  const part = form?.find(item => item.name === name)
-  return part?.data?.length ? new TextDecoder().decode(part.data).trim() : ''
+function field(form: FormData, name: string): string {
+  const value = form.get(name)
+  return typeof value === 'string' ? value.trim() : ''
 }
 
 export default defineEventHandler(async (event) => {
   await requireSiteSyncAuth(event)
-  const form = await readMultipartFormData(event)
-  if (!form?.length) createApiError(event, 'INVALID_REQUEST', '未收到同步数据', 400)
+  const contentLength = Number(getHeader(event, 'content-length') || 0)
+  if (contentLength > MAX_VIDEO_FILE_SIZE + 1024 * 1024) {
+    createApiError(event, 'FILE_TOO_LARGE', '同步文件超过 500 MB', 413)
+  }
+  const form = await readFormData(event)
 
   const key = field(form, 'key')
-  const file = form.find(part => part.name === 'file' && part.data?.length)
-  if (!validateStorageKey(key) || !file?.data) {
+  const file = readFormDataFiles(form, ['file'])[0]
+  if (!validateStorageKey(key) || !file) {
     createApiError(event, 'INVALID_REQUEST', '同步文件参数无效', 400)
   }
-  if (file.data.length > MAX_VIDEO_FILE_SIZE) {
+  if (file.size > MAX_VIDEO_FILE_SIZE) {
     createApiError(event, 'FILE_TOO_LARGE', '同步文件超过 500 MB', 413)
   }
 
@@ -51,11 +55,11 @@ export default defineEventHandler(async (event) => {
     })
   }
 
-  await backend.put(key, new Uint8Array(file.data), {
-    originalName: field(form, 'originalName') || file.filename || key.split('/').pop() || 'file',
+  await backend.put(key, new Uint8Array(await file.arrayBuffer()), {
+    originalName: field(form, 'originalName') || file.name || key.split('/').pop() || 'file',
     uploadedAt: field(form, 'uploadedAt') || new Date().toISOString(),
     contentType: file.type || field(form, 'contentType') || 'application/octet-stream',
-    size: file.data.length,
+    size: file.size,
     userId: owner?.id ?? null,
     mediaType: key.startsWith('videos/')
       ? 'video'