Fix volume SELinux labels and build.sh deploy instructions

- quadlet: :Z → :z (shared) to allow concurrent access with asr.service
- build.sh: --user systemd → system systemd paths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build.sh

@@ -11,9 +11,9 @@ echo "빌드 완료: $IMAGE"
 echo ""
 echo "배포 방법:"
 echo "  1. quadlet 파일 복사:"
-echo "     cp quadlet/asr-v2.container ~/.config/containers/systemd/"
+echo "     cp quadlet/asr-v2.container /etc/containers/systemd/"
 echo "  2. systemd 리로드 및 시작:"
-echo "     systemctl --user daemon-reload"
-echo "     systemctl --user start asr-v2"
+echo "     systemctl daemon-reload"
+echo "     systemctl start asr-v2"
 echo "  3. 로그 확인:"
-echo "     journalctl --user -u asr-v2 -f"
+echo "     journalctl -u asr-v2 -f"