feat(perfectprivacy): port forwarding support (#2378)

internal/configuration/settings/portforward.go

@@ -50,6 +50,7 @@ func (p PortForwarding) Validate(vpnProvider string) (err error) {
 		providerSelected = *p.Provider
 	}
 	validProviders := []string{
+		providers.Perfectprivacy,
 		providers.PrivateInternetAccess,
 		providers.Protonvpn,
 	}