refactor: stage uploads before drive and git delivery

app/api/upload/drive/route.ts

@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { validateUploadSecret } from '@/lib/auth'
-import { parseMultiUpload } from '@/lib/parse-upload'
+import { readStagedOriginalFiles } from '@/lib/upload-staging'
 import {
   mkdirRecursive,
   moveFolder,
@@ -17,8 +17,8 @@ export const dynamic = 'force-dynamic'
 //
 // Upload **original** files (no Blender compression) to Nextcloud Drive.
 //
-// FormData fields:
-//   - folderName, files[], fileTypes[], textureNames[]  (same as /api/upload/git)
+// JSON body:
+//   - stagingId
 //   - action: "new" | "replace"
 //
 // Versioning logic:
@@ -42,16 +42,21 @@ export async function POST(req: NextRequest) {
     )
   }
 
-  // --- Parse files (includes extra fields like "action") ---
+  // --- Parse staging request ---
   let folderName: string
-  let parsedFiles: Awaited<ReturnType<typeof parseMultiUpload>>['files']
+  let parsedFiles: Awaited<ReturnType<typeof readStagedOriginalFiles>>['files']
   let action: string
 
   try {
-    const parsed = await parseMultiUpload(req)
-    folderName = parsed.folderName
-    parsedFiles = parsed.files
-    action = parsed.extra.action?.trim() || 'new'
+    const body = await req.json()
+    const stagingId = body.stagingId
+    if (!stagingId || typeof stagingId !== 'string') {
+      throw new Error('stagingId manquant')
+    }
+    action = typeof body.action === 'string' ? body.action.trim() || 'new' : 'new'
+    const staged = await readStagedOriginalFiles(stagingId)
+    folderName = staged.folderName
+    parsedFiles = staged.files
   } catch (err) {
     const message = err instanceof Error ? err.message : 'Erreur inconnue'
     return NextResponse.json({ success: false, error: message }, { status: 400 })