feat(ntfy): add SendNtfyNotificationJob for async dispatch with retry

app/jobs/send_ntfy_notification_job.rb

@@ -0,0 +1,23 @@
+require "my_smsa_pio/notifications/ntfy/publisher"
+
+class SendNtfyNotificationJob < ApplicationJob
+  queue_as :notifications
+  retry_on StandardError, wait: :exponentially_longer, attempts: 3
+
+  def perform(admin_id, event_type, title:, message:, priority: 3, tags: [], click: nil)
+    admin = AdminUser.find_by(id: admin_id)
+    return unless admin
+    return unless admin.ntfy_configured?
+
+    MySmsaPio::Notifications::Ntfy::Publisher.new(admin).publish(
+      title: title,
+      message: message,
+      priority: priority,
+      tags: tags,
+      click: click
+    )
+  rescue StandardError => e
+    Rails.logger.error("SendNtfyNotificationJob failed for admin #{admin_id}: #{e.message}")
+    raise
+  end
+end