refactor: Correctly assign file parts array in response object

src/app/api/file/[file_id]/route.ts

@@ -64,7 +64,7 @@ export async function GET(request: NextRequest, context: RouteContext) {
         filename: file.filename,
         size: file.size,
         num_parts: file.num_parts,
-        parts: partsRows[0] as FilePartMetadata[],
+        parts: partsRows as FilePartMetadata[],
       };
 
       return NextResponse.json(response);