Add users and network settings tabs with admin protections.

List and delete accounts with last-admin and Administrators-group guards, and expose editable network settings via the configuration UI.

service/cmd/server/main.go

@@ -34,14 +34,16 @@ func main() {
 		port = "8080"
 	}
 
+	listenHost := settings.ListenHost(configDir)
+	listenAddr := listenHost + ":" + port
 	server := &http.Server{
-		Addr:              ":" + port,
+		Addr:              listenAddr,
 		Handler:           api.NewRouter(configDir),
 		ReadHeaderTimeout: 5 * time.Second,
 	}
 
 	go func() {
-		log.Printf("clustercanvas service listening on %s", server.Addr)
+		log.Printf("clustercanvas service listening on http://%s", listenAddr)
 		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
 			log.Fatalf("listen: %v", err)
 		}