fix(hysteria2): emit https server_url for sing-box realm outbound (#9642)

sing-box requires realm.server_url as a full URL (https://host:port).
Bare host:port caused "missing host in realm server_url" on import.
Also forward stun_servers and clear ResolveRealm success message.

Fixes #9635

v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs

@@ -275,9 +275,10 @@ public partial class CoreConfigSingboxService
                         {
                             var realm4Sbox = new HyRealm4Sbox()
                             {
-                                server_url = realm.RendezvousHostPort,
+                                server_url = realm.ToServerUrl(),
                                 token = realm.Token,
                                 realm_id = realm.RealmName,
+                                stun_servers = realm.StunList?.Count > 0 ? realm.StunList : null,
                             };
                             outbound.realm = realm4Sbox;
                             outbound.server = null;