Move VPN route display from vpn-connection to vpn-download

Consolidate VPN-related information under openvpn-vpn-download service.
Now shows both VPN route and torrent statistics as sub-services.

- Remove route from openvpn-vpn-connection
- Add route to openvpn-vpn-download (displayed first)
- Torrent stats displayed second
- Update version to v0.1.251

agent/src/collectors/systemd.rs

@@ -154,7 +154,8 @@ impl SystemdCollector {
                         }
                     }
 
-                    if service_name == "openvpn-vpn-connection" && status_info.active_state == "active" {
+                    if service_name == "openvpn-vpn-download" && status_info.active_state == "active" {
+                        // Add VPN route
                         if let Some(external_ip) = self.get_vpn_external_ip() {
                             let metrics = Vec::new();
 
@@ -165,9 +166,8 @@ impl SystemdCollector {
                                 service_type: "vpn_route".to_string(),
                             });
                         }
-                    }
 
-                    if service_name == "openvpn-vpn-download" && status_info.active_state == "active" {
+                        // Add torrent stats
                         if let Some((active_count, download_mbps, upload_mbps)) = self.get_qbittorrent_stats() {
                             let metrics = Vec::new();