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/lib/tasks/ops.rake

@@ -0,0 +1,41 @@
+namespace :ops do
+  desc "Esegue health check ops e registra incidenti"
+  task health_check: :environment do
+    findings = Ops::HealthChecks.new.call
+    unhealthy = findings.reject(&:healthy)
+    puts "Health check completato: #{findings.size} controlli, #{unhealthy.size} problemi"
+    unhealthy.each do |f|
+      puts "  [#{f.severity}] #{f.title}: #{f.message}"
+    end
+  end
+
+  desc "Ingestione log da stdin o file (rails ops:ingest_logs[path])"
+  task :ingest_logs, [:path] => :environment do |_t, args|
+    text = if args[:path].present?
+             File.read(args[:path])
+           else
+             $stdin.read
+           end
+    count = Ops::LogScanner.new.ingest(text)
+    puts "Log scanner: #{count} match trovati"
+  end
+
+  desc "Invia notifica di test (ntfy/email)"
+  task test_notify: :environment do
+    incident = Ops::Incident.create!(
+      kind: "test",
+      severity: "critical",
+      status: "open",
+      title: "Test notifica ops",
+      message: "Verifica canale notifiche Match Live TV — #{Time.current}",
+      metadata: {},
+      fingerprint: "test:#{SecureRandom.hex(4)}",
+      occurrence_count: 1,
+      first_seen_at: Time.current,
+      last_seen_at: Time.current
+    )
+    Ops::Notifier.new.notify(incident)
+    incident.resolve!
+    puts "Notifica di test inviata"
+  end
+end