fix: ensure pulse user is created during updates

- Add create_user() call to update flow (option 1)
- Add create_user() call to reinstall flow (option 2)
- Fixes 'chown: invalid user: pulse:pulse' error on older installations
- Ensures smooth migration from root/other users to pulse user

install.sh

@@ -363,6 +363,7 @@ main() {
             1)
                 backup_existing
                 systemctl stop $SERVICE_NAME || true
+                create_user
                 download_pulse
                 start_pulse
                 print_completion
@@ -370,6 +371,7 @@ main() {
             2)
                 backup_existing
                 systemctl stop $SERVICE_NAME || true
+                create_user
                 download_pulse
                 setup_directories
                 install_systemd_service