alyssum/home.syncthing: set proper defaults

hosts/alyssum/home.syncthing.nix

@@ -4,6 +4,8 @@ let
     me.binds."/home/${user}/.config/syncthing" = "${user}/syncthing/config";
     me.binds."/home/${user}/.local/state/syncthing" = "${user}/syncthing/state";
 
+    systemd.tmpfiles.rules = [ "d /flower/syncthing/${user} 700 ${user} users" ];
+
     users.users.${user} = {
       hashedPasswordFile = config.age.secrets.passwd.path;
       isNormalUser = true;
@@ -18,6 +20,12 @@ let
       services.syncthing = {
         enable = true;
         guiAddress = "[::]:${toString port}";
+        options.listenAddresses = [
+          "tcp://0.0.0.0:2${toString port}"
+          "quic://0.0.0.0:2${toString port}"
+          "dynamic+https://relays.syncthing.net/endpoint"
+        ];
+        settings.defaults.folder.path = "/flower/syncthing/${user}";
       };
     };
   };