feat(ntfy): add Ntfy::Publisher service with HTTP POST + auth

lib/my_smsa_pio/notifications/ntfy/publisher.rb

@@ -0,0 +1,49 @@
+require "httparty"
+
+module MySmsaPio
+  module Notifications
+    module Ntfy
+      class Publisher
+        def initialize(admin)
+          @admin = admin
+        end
+
+        def publish(title:, message:, priority: 3, tags: [], click: nil)
+          return false unless @admin.ntfy_configured?
+
+          body = {
+            topic: @admin.ntfy_topic,
+            title: title,
+            message: message,
+            priority: priority,
+            tags: Array(tags)
+          }
+          body[:click] = click if click.present?
+
+          url = "#{server_url}/#{@admin.ntfy_topic}"
+
+          response = HTTParty.post(
+            url,
+            body: body.to_json,
+            headers: {
+              "Content-Type" => "application/json",
+              "Authorization" => "Bearer #{@admin.ntfy_token}"
+            },
+            timeout: 10
+          )
+
+          response.success?
+        rescue StandardError => e
+          Rails.logger.error("ntfy publish failed for admin #{@admin.id}: #{e.message}")
+          false
+        end
+
+        private
+
+        def server_url
+          @admin.ntfy_server_url.presence || ENV["NTFY_SERVER_URL"] || "https://ntfy.sh"
+        end
+      end
+    end
+  end
+end