fix: support gltf uploads with local preview

app/api/upload/drive/route.ts

@@ -15,7 +15,7 @@ export const dynamic = 'force-dynamic'
 // ---------------------------------------------------------------------------
 // POST /api/upload/drive
 //
-// Upload **original** files (no Blender compression) to Nextcloud Drive.
+// Upload **original** files to Nextcloud Drive.
 //
 // JSON body:
 //   - stagingId

app/api/upload/git/route.ts

@@ -11,7 +11,7 @@ export const dynamic = 'force-dynamic'
 
 /**
  * POST /api/upload/git
- * Upload files, compress with Blender, and push to GitHub via Octokit.
+ * Upload prepared files and push to GitHub via Octokit.
  */
 export async function POST(req: NextRequest) {
   // --- Auth ---
@@ -42,7 +42,7 @@ export async function POST(req: NextRequest) {
   }
 
   try {
-    // --- Process files (compress model + textures for Git) ---
+    // --- Process files (preserve model + buffers, compress textures for Git) ---
     const {
       filesToPush,
       modelFilename,