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.json

@@ -19,7 +19,6 @@
         { "hostPath": "${APP_DATA_DIR}/config", "containerPath": "/config", "readOnly": false },
         { "hostPath": "${APP_DATA_DIR}", "containerPath": "/runtime", "readOnly": false },
         { "hostPath": "/etc/runtipi/repos/runtipi/apps/cistech-tunnel/shared", "containerPath": "/shared", "readOnly": false },
-        { "hostPath": "/sys/fs/cgroup", "containerPath": "/sys/fs/cgroup", "readOnly": false },
         { "hostPath": "/etc/runtipi/repos/runtipi/apps/cistech-tunnel/shared/xstartup", "containerPath": "/root/.vnc/xstartup", "readOnly": true }
       ],
       "stopGracePeriod": "30s",