fix: prevent duplicate uploads and group asset commits

app/api/upload/drive/route.ts

@@ -7,6 +7,7 @@ import {
   uploadFile,
   findNextVersion,
 } from '@/lib/nextcloud'
+import { acquireUploadLock, releaseUploadLock } from '@/lib/upload-lock'
 
 export const runtime = 'nodejs'
 export const dynamic = 'force-dynamic'
@@ -56,6 +57,13 @@ export async function POST(req: NextRequest) {
     return NextResponse.json({ success: false, error: message }, { status: 400 })
   }
 
+  if (!acquireUploadLock(folderName)) {
+    return NextResponse.json(
+      { success: false, error: 'Un upload est deja en cours pour ce dossier. Patientez quelques secondes.' },
+      { status: 409 },
+    )
+  }
+
   const basePath = process.env.NEXTCLOUD_BASE_PATH || 'Models'
   const vfFolderPath = `${basePath}/VF/${folderName}`
 
@@ -95,5 +103,7 @@ export async function POST(req: NextRequest) {
       { success: false, error: `Drive echoue: ${message}` },
       { status: 500 },
     )
+  } finally {
+    releaseUploadLock(folderName)
   }
 }