chore: gitignore the NPU runtime zip (was wrongly under Vite's dist/)

.gitignore

@@ -37,4 +37,7 @@ Thumbs.db
 .env
 .env.*
 !.env.example
-dist/
+
+# NPU runtime bundle: a large binary artifact hosted as a Gitea package, not
+# committed. The folder's README is tracked; the zip is produced locally.
+packaging/npu-runtime/*.zip