refactor(cistech-tunnel): remove all systemd dependencies

- Dockerfile: Removed systemd, systemd-sysv, network-manager packages
- Dockerfile: Removed systemd service cleanup, vnc.service, cgroup volume
- docker-compose.json/yml: Removed /sys/fs/cgroup volume mount
- Bumped tipi_version to 4

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/cistech-tunnel/docker-compose.yml

@@ -22,7 +22,6 @@ services:
       - ${APP_DATA_DIR}/config:/config
       - ${APP_DATA_DIR}:/runtime
       - /etc/runtipi/repos/runtipi/apps/cistech-tunnel/shared:/shared
-      - /sys/fs/cgroup:/sys/fs/cgroup
       - /etc/runtipi/repos/runtipi/apps/cistech-tunnel/shared/xstartup:/root/.vnc/xstartup:ro
     devices:
       - /dev/net/tun