- agent-install.sh and agent-uninstall.sh now detect if running as root
at startup and re-execute via 'script -qc sudo bash' if needed
- AgentService commands simplified: just write to /tmp and run bash,
the scripts handle privilege escalation internally
- Fixes exit code propagation: the script's exit code now correctly
flows back through exec -> script -> sudo -> bash -> SSH
The sudo -n check was incorrectly detecting that sudo required a
password, causing fallback to plain bash without root permissions.
Now we always run the installer via sudo bash, consistent with how
all other SSH commands work (systemctl, reboot, etc.).
- Add database migration 006 for agent_key, agent_installed, agent_install_path, agent_last_seen_at columns
- Add Server model methods: findByAgentKey, generateAgentKey, regenerateAgentKey, updateAgentLastSeen, setAgentInstalled
- Auto-generate agent_key on server creation
- Create AgentService for SSH-based install/uninstall of remote agent
- Create bin/agent.sh - bash agent script for remote servers
- Create install/agent-install.sh and install/agent-uninstall.sh
- Create install/servermanager-agent.service systemd unit
- Add POST /api/metrics/push endpoint (auth via agent_key)
- Add web routes for agent install/uninstall/regenerate-key
- Add agent status section to server detail view with install/uninstall modals
- Make MonitoringService::saveMetrics() public for reuse
