chore(core): add .gitignore rules for yazi plugins and whitelist bunny.yazi

.gitignore

@@ -1,5 +1,9 @@
 /dot_config/lazygit/dot_omc
 /dot_config/tmux/plugins
+# yazi plugins installed by `ya pkg install`; bunny.yazi is vendored because
+# ya can't materialize its repo's directory symlink
+/yazi/plugins/*
+!/yazi/plugins/bunny.yazi/
 
 # Beads / Dolt files (added by bd init)
 .dolt/