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/db/migrate/20260611120000_create_ops_incidents.rb

@@ -0,0 +1,26 @@
+class CreateOpsIncidents < ActiveRecord::Migration[7.2]
+  def change
+    create_table :ops_incidents, id: :uuid do |t|
+      t.string :kind, null: false
+      t.string :severity, null: false, default: "warning"
+      t.string :status, null: false, default: "open"
+      t.string :title, null: false
+      t.text :message
+      t.jsonb :metadata, null: false, default: {}
+      t.string :fingerprint, null: false
+      t.integer :occurrence_count, null: false, default: 1
+      t.datetime :first_seen_at, null: false
+      t.datetime :last_seen_at, null: false
+      t.datetime :notified_at
+      t.datetime :acknowledged_at
+      t.datetime :muted_until
+
+      t.timestamps
+    end
+
+    add_index :ops_incidents, :fingerprint
+    add_index :ops_incidents, %i[status severity]
+    add_index :ops_incidents, :last_seen_at
+    add_index :ops_incidents, %i[fingerprint status]
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2026_06_09_100000) do
+ActiveRecord::Schema[7.2].define(version: 2026_06_11_120000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -160,6 +160,28 @@ ActiveRecord::Schema[7.2].define(version: 2026_06_09_100000) do
     t.index ["team_id"], name: "index_matches_on_team_id"
   end
 
+  create_table "ops_incidents", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.string "kind", null: false
+    t.string "severity", default: "warning", null: false
+    t.string "status", default: "open", null: false
+    t.string "title", null: false
+    t.text "message"
+    t.jsonb "metadata", default: {}, null: false
+    t.string "fingerprint", null: false
+    t.integer "occurrence_count", default: 1, null: false
+    t.datetime "first_seen_at", null: false
+    t.datetime "last_seen_at", null: false
+    t.datetime "notified_at"
+    t.datetime "acknowledged_at"
+    t.datetime "muted_until"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["fingerprint", "status"], name: "index_ops_incidents_on_fingerprint_and_status"
+    t.index ["fingerprint"], name: "index_ops_incidents_on_fingerprint"
+    t.index ["last_seen_at"], name: "index_ops_incidents_on_last_seen_at"
+    t.index ["status", "severity"], name: "index_ops_incidents_on_status_and_severity"
+  end
+
   create_table "plans", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.string "slug", null: false
     t.string "name", null: false