fix: use pkgs.ntfy-sh instead of pkgs.ntfy

pkgs.ntfy on nixos-26.05 resolves to ntfy 2.7.1 (a different tool that
also ships bin/ntfy but doesn't have a 'subscribe' subcommand).
pkgs.ntfy-sh is the correct ntfy.sh notification client at v2.23.0.

modules/home-manager/ntfy-notify/default.nix

@@ -1,3 +1,5 @@
+Warning: Identity file /home/jpporta/.ssh/id_rsa not accessible: No such file or directory.
+Warning: Identity file /home/jpporta/.ssh/id_rsa not accessible: No such file or directory.
 {
   config,
   lib,
@@ -54,7 +56,7 @@ in
   };
 
   config = lib.mkIf cfg.enable {
-    home.packages = [ pkgs.ntfy ];
+    home.packages = [ pkgs.ntfy-sh ];
 
     # Client config with subscription → notify-send mappings.
     # ntfy subscribe (without args) reads subscriptions from here.
@@ -79,7 +81,7 @@ in
       Service = {
         Type = "simple";
         ExecStart = ''
-          ${pkgs.ntfy}/bin/ntfy subscribe
+          ${pkgs.ntfy-sh}/bin/ntfy subscribe
         '';
         Restart = "on-failure";
         RestartSec = 10;