chore: 删除 design-styles 风格探索稿——使命完成，定稿见 design-system

design-refs/mockup/build.sh

@@ -17,7 +17,7 @@ export TMPDIR="$HOME/.cache/h2p-tmp"
 
 STEMS=("$@")
 if [ ${#STEMS[@]} -eq 0 ]; then
-  STEMS=(course-shelf components color-system design-styles design-system)
+  STEMS=(course-shelf components color-system design-system)
 fi
 
 for STEM in "${STEMS[@]}"; do