Add Windows installer packaging (Setup.exe + portable exe)

PyInstaller onedir/onefile specs, Inno Setup script, and GitHub Actions
workflow to produce JUC500-Setup-win64.exe and portable builds.

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

build-installer-windows.sh

@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+# JUC500 Windows 설치파일 생성
+# Apple Silicon: --ci 로 GitHub Actions 사용
+# Windows PC:    build-installer-windows.bat
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")" && pwd)"
+cd "$ROOT"
+
+echo "============================================"
+echo " JUC500 — Windows Installer 빌드"
+echo "============================================"
+echo ""
+
+usage() {
+  cat <<'EOF'
+사용법:
+  ./build-installer-windows.sh --ci      # GitHub Actions 빌드 + 산출물 다운로드
+  ./build-installer-windows.sh --help
+
+Windows PC 에서는 build-installer-windows.bat 를 실행하세요.
+EOF
+}
+
+download_ci_artifact() {
+  if ! command -v gh >/dev/null 2>&1; then
+    echo "gh (GitHub CLI) 가 필요합니다: brew install gh && gh auth login" >&2
+    exit 1
+  fi
+  if [[ ! -f vendor/libusb-1.0.dll ]]; then
+    echo "vendor/libusb-1.0.dll 이 저장소에 있어야 CI 가 번들합니다." >&2
+    exit 1
+  fi
+  mkdir -p dist-windows
+  echo "==> GitHub Actions workflow 실행 (build-windows.yml)"
+  gh workflow run build-windows.yml
+  echo "==> 실행 대기…"
+  sleep 4
+  RUN_ID="$(gh run list --workflow=build-windows.yml --limit 1 --json databaseId --jq '.[0].databaseId')"
+  if [[ -z "$RUN_ID" || "$RUN_ID" == "null" ]]; then
+    echo "workflow run id 를 찾지 못했습니다. 원격 저장소·workflow 푸시를 확인하세요." >&2
+    exit 1
+  fi
+  echo "    run id: $RUN_ID"
+  gh run watch "$RUN_ID" --exit-status
+  rm -rf dist-windows/_ci_dl
+  mkdir -p dist-windows/_ci_dl
+  gh run download "$RUN_ID" -n juc500-windows-x64 -D dist-windows/_ci_dl
+  find dist-windows/_ci_dl -type f \( \
+      -name 'JUC500-Setup-win64.exe' \
+      -o -name 'JUC500-win64-portable.zip' \
+      -o -name 'JUC500-portable.exe' \
+    \) -exec cp -f {} dist-windows/ \;
+  rm -rf dist-windows/_ci_dl
+  echo ""
+  echo "============================================"
+  echo " Windows 설치파일 완료 (GitHub Actions)"
+  echo "============================================"
+  ls -lh dist-windows/JUC500-Setup-win64.exe \
+        dist-windows/JUC500-win64-portable.zip \
+        dist-windows/JUC500-portable.exe 2>/dev/null || {
+    echo "산출물이 dist-windows/ 에 없습니다. Actions 로그를 확인하세요." >&2
+    exit 1
+  }
+}
+
+case "${1:-}" in
+  -h|--help) usage; exit 0 ;;
+  --ci|--github|--actions) download_ci_artifact; exit 0 ;;
+  "")
+    if [[ "$(uname -s)" == "Darwin" ]]; then
+      usage
+      echo ""
+      echo "이 Mac에서는 ./build-installer-windows.sh --ci 를 사용하세요."
+      exit 1
+    fi
+    ;;
+esac
+
+echo "Windows 에서는 build-installer-windows.bat 를 실행하세요."
+exit 1