fix(plugin): CloseIdleConnections silent no-op when tokenTransport wraps HTTP transport

tokenTransport now delegates CloseIdleConnections to the underlying
*http.Transport so http.Client.CloseIdleConnections() works through
the wrapper. Three plugin Close() methods updated to unwrap via
HTTPClientTransport before calling CloseIdleConnections.

RoundTrip now short-circuits when caller already set Authorization,
avoiding an unnecessary req.Clone allocation on the pass-through path.

config/parsing/ingress/parse.go

@@ -33,6 +33,7 @@ func ParseIngress(cfg *config.IngressConfig) ingress.Ingress {
 		case "http":
 			return ingress_plugin.NewHTTPPlugin(
 				cfg.Name, cfg.Plugin.Addr,
+				plugin.TokenOption(cfg.Plugin.Token),
 				plugin.TLSConfigOption(tlsCfg),
 				plugin.TimeoutOption(cfg.Plugin.Timeout),
 			)