Fix CI failure by removing paru-bin submodule

Remove paru-bin directory that was incorrectly added as a git submodule.
This directory is an AUR build artifact and should not be tracked.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: yichuan-w

.gitignore

@@ -105,3 +105,6 @@ apps/multimodal/vision-based-pdf-multi-vector/multi-vector-colpali-native-weavia
 # The following line used to force-add a large demo PDF; remove it to satisfy pre-commit:
 # !apps/multimodal/vision-based-pdf-multi-vector/pdfs/2004.12832v2.pdf
 !apps/multimodal/vision-based-pdf-multi-vector/fig/*
+
+# AUR build directory (Arch Linux)
+paru-bin/