Vendor pyusb wheel for offline Windows source installs

Include pyusb-1.2.1-py3-none-any.whl under vendor/wheels and wire
setup scripts to pip install --no-index --find-links.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/setup_macos.sh

@@ -14,12 +14,15 @@ python3 -m venv .venv
 # shellcheck disable=SC1091
 source .venv/bin/activate
 pip install -U pip
-pip install -r requirements.txt
+# vendor wheel 우선 (오프라인 가능)
+pip install --no-index --find-links=vendor/wheels -r requirements.txt \
+  || pip install --find-links=vendor/wheels -r requirements.txt
 pip install -e .
 
 echo
 echo "설치 완료. 예:"
 echo "  source $ROOT/.venv/bin/activate"
 echo "  juc500 info"
+echo "  juc500 gui"
 echo "  juc500 recv -y --dest ~/Downloads"
 echo "  juc500 send /path/to/file"