fix: support gltf uploads with local preview

lib/parse-upload.ts

@@ -49,6 +49,7 @@ export async function parseMultiUpload(req: NextRequest): Promise<ParsedUpload>
   }
 
   const parsed: ParsedFile[] = []
+  let modelCount = 0
 
   for (let i = 0; i < fileEntries.length; i++) {
     const file = fileEntries[i]
@@ -79,10 +80,24 @@ export async function parseMultiUpload(req: NextRequest): Promise<ParsedUpload>
     }
 
     const isModel = MODEL_EXTENSIONS.has(ext)
+    if (isModel) {
+      if (filename.toLowerCase() !== 'model.gltf') {
+        throw new Error('Le modele doit etre nomme model.gltf')
+      }
+      modelCount += 1
+    }
     const buffer = Buffer.from(await file.arrayBuffer())
 
     parsed.push({ filename, buffer, isModel })
   }
 
+  if (modelCount === 0) {
+    throw new Error('model.gltf manquant (obligatoire)')
+  }
+
+  if (modelCount > 1) {
+    throw new Error('Un seul fichier model.gltf est autorise')
+  }
+
   return { folderName: safeFolderName, files: parsed, extra }
 }