Add systemd support and pre-installed Cisco 5.1.14.145 binaries

- Add systemd, dbus packages to Dockerfile
- Pre-install Cisco Secure Client 5.1.14.145 binaries
- Add hosts entries for VPN servers at runtime
- Add cgroup volume mount for systemd support
- Start dbus daemon in entrypoint for Cisco client

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/rego-tunnel-linux/docker-compose.json

@@ -29,6 +29,13 @@
           "readOnly": true,
           "shared": false,
           "private": false
+        },
+        {
+          "hostPath": "/sys/fs/cgroup",
+          "containerPath": "/sys/fs/cgroup",
+          "readOnly": false,
+          "shared": false,
+          "private": false
         }
       ],
       "devices": [