Feature: filter by hostname for PureVPN servers

- Record support for TCP and UDP for each hostname
- Fix: each hostname supports only TCP or UDP, not both
- Update PureVPN server information

internal/updater/providers/purevpn/sort.go

@@ -10,6 +10,9 @@ func sortServers(servers []models.PurevpnServer) {
 	sort.Slice(servers, func(i, j int) bool {
 		if servers[i].Country == servers[j].Country {
 			if servers[i].Region == servers[j].Region {
+				if servers[i].City == servers[j].City {
+					return servers[i].Hostname < servers[j].Hostname
+				}
 				return servers[i].City < servers[j].City
 			}
 			return servers[i].Region < servers[j].Region