Add VPS health endpoint

src/main/java/com/litoralregas/vpnprovisioner/vps/VpsController.java

@@ -0,0 +1,20 @@
+package com.litoralregas.vpnprovisioner.vps;
+
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/vps")
+public class VpsController {
+
+    private final WireGuardVpsService wireGuardVpsService;
+
+    public VpsController(WireGuardVpsService wireGuardVpsService) {
+        this.wireGuardVpsService = wireGuardVpsService;
+    }
+
+    @GetMapping(value = "/health", produces = MediaType.APPLICATION_JSON_VALUE)
+    public String health() {
+        return wireGuardVpsService.getVpsHealthJson();
+    }
+}

src/main/java/com/litoralregas/vpnprovisioner/vps/WireGuardVpsService.java

@@ -21,7 +21,7 @@ public class WireGuardVpsService {
 
     public Set<String> findUsedVpnIps() {
         SshCommandResult result = sshService.executeOnConfiguredVps(
-                "sudo wg show wg0 allowed-ips"
+                "sudo /usr/local/sbin/lr-wg-used-ips"
         );
 
         if (result.exitCode() != 0) {
@@ -65,4 +65,18 @@ public class WireGuardVpsService {
                 true
         );
     }
+
+    public String getVpsHealthJson() {
+        SshCommandResult result = sshService.executeOnConfiguredVps(
+                "sudo /usr/local/sbin/lr-vps-health"
+        );
+
+        if (result.exitCode() != 0) {
+            throw new SshCommandException(
+                    "Failed to query VPS health: " + result.stderr()
+            );
+        }
+
+        return result.stdout();
+    }
 }