Aggiunge monitoraggio ops: health check, log scanner, dashboard e notifiche.

Introduce incidenti con dedup, job Sidekiq ogni 3 min, scan log cron, /up/deep,
dashboard /admin/ops e push ntfy; include Sentry opzionale e fix test suite.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/ops/notifier.rb

@@ -0,0 +1,65 @@
+module Ops
+  class Notifier
+    class Error < StandardError; end
+
+    def self.notify_severity?(severity)
+      levels = ENV.fetch("OPS_NOTIFY_SEVERITIES", "critical").split(",").map(&:strip)
+      levels.include?(severity.to_s)
+    end
+
+    def notify(incident)
+      notify_ntfy(incident) if ntfy_url.present?
+      notify_email(incident) if alert_email.present?
+    end
+
+    private
+
+    def notify_ntfy(incident)
+      priority = incident.severity == "critical" ? "5" : "3"
+      tags = incident.severity == "critical" ? "rotating_light" : "warning"
+
+      conn = Faraday.new do |f|
+        f.adapter Faraday.default_adapter
+        f.options.timeout = 10
+        f.options.open_timeout = 5
+      end
+
+      headers = {
+        "Title" => "[Match Live TV] #{incident.title}",
+        "Priority" => priority,
+        "Tags" => tags
+      }
+      headers["Authorization"] = "Bearer #{ntfy_token}" if ntfy_token.present?
+
+      body = incident.message.to_s
+      body += "\n\n(#{incident.occurrence_count} occorrenze)" if incident.occurrence_count > 1
+
+      response = conn.post(ntfy_url, body, headers)
+      return if response.success?
+
+      Rails.logger.warn("[Ops::Notifier] ntfy failed: #{response.status} #{response.body}")
+    rescue Faraday::Error => e
+      Rails.logger.warn("[Ops::Notifier] ntfy error: #{e.message}")
+    end
+
+    def notify_email(incident)
+      return unless defined?(ActionMailer)
+
+      Ops::AlertMailer.incident(incident).deliver_later
+    rescue StandardError => e
+      Rails.logger.warn("[Ops::Notifier] email error: #{e.message}")
+    end
+
+    def ntfy_url
+      ENV["OPS_NTFY_URL"].presence
+    end
+
+    def ntfy_token
+      ENV["OPS_NTFY_TOKEN"].presence
+    end
+
+    def alert_email
+      ENV["OPS_ALERT_EMAIL"].presence
+    end
+  end
+end