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/spec/services/ops/log_pattern_matcher_spec.rb

@@ -0,0 +1,24 @@
+require "rails_helper"
+
+RSpec.describe Ops::LogPatternMatcher do
+  subject(:matcher) do
+    described_class.new(
+      patterns: [
+        { name: "http_500", severity: "warning", regex: /Completed 500/i },
+        { name: "disk_full", severity: "critical", regex: /No space left on device/i }
+      ]
+    )
+  end
+
+  it "trova pattern nei log" do
+    log = <<~LOG
+      I, [2026-06-10T19:45:10] Completed 500 Internal Server Error
+      E, [2026-06-10T19:45:11] No space left on device - /recordings
+    LOG
+
+    matches = matcher.scan(log)
+
+    expect(matches.map(&:name)).to contain_exactly("http_500", "disk_full")
+    expect(matches.find { |m| m.name == "disk_full" }.severity).to eq("critical")
+  end
+end