feat(ntfy): wire Home Assistant rest_command publisher

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/environments/ntfy/default.nix

@@ -31,7 +31,8 @@ in
     };
   };
 
-  config = lib.mkIf cfg.enable {
+  config = lib.mkMerge [
+    (lib.mkIf cfg.enable {
       services.ntfy-sh = {
         enable = true;
         settings = {
@@ -53,5 +54,21 @@ in
           icon = "ntfy.svg";
         }
       ];
+    })
+
+    (lib.mkIf (cfg.enable && cfg.haIntegration.enable && config.my.profiles.home-assistant.enable) {
+      services.home-assistant.config.rest_command.ntfy_send = {
+        url = "http://${hostName}:${toString cfg.port}/${cfg.topic}";
+        method = "POST";
+        payload = "{{ message }}";
+        content_type = "text/plain";
+        username = "homeassistant";
+        password = "!secret ntfy_password";
+        headers = {
+          Title = "{{ title | default('Home Assistant') }}";
+          Priority = "{{ priority | default('default') }}";
         };
+      };
+    })
+  ];
 }