Add Status::Info for informational sub-services

Agent uses Status enum to control display:
- Status::Info: no icon, no status text (VPN IP)
- Other statuses: icon + text (containers, nginx sites)

Dashboard checks status, no hardcoded service_type exceptions.

Version: v0.1.237

agent/src/collectors/systemd.rs

@@ -168,7 +168,7 @@ impl SystemdCollector {
 
                                 sub_services.push(SubServiceData {
                                     name: format!("ip: {}", external_ip),
-                                    service_status: Status::Ok,
+                                    service_status: Status::Info,
                                     metrics,
                                     service_type: "vpn_route".to_string(),
                                 });