Correções de integração Fases 2/3 ↔ 4-8 + Auditoria UI + README final

db/migrate/20260101000010_add_devise_trackable_to_users.rb

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+# Migration corrigida da Fase 2:
+# - Timestamp no padrão (roda DEPOIS da create_users)
+# - Removidos pin_acesso e ativo (já existem como pin_code e ativo na create_users)
+# - Mantidos apenas os campos Devise trackable + lockable
+class AddDeviseTrackableToUsers < ActiveRecord::Migration[7.1]
+  def change
+    # Trackable
+    add_column :users, :sign_in_count,      :integer, default: 0, null: false
+    add_column :users, :current_sign_in_at, :datetime
+    add_column :users, :last_sign_in_at,    :datetime
+    add_column :users, :current_sign_in_ip, :string
+    add_column :users, :last_sign_in_ip,    :string
+
+    # Lockable
+    add_column :users, :failed_attempts, :integer, default: 0, null: false
+    add_column :users, :unlock_token,    :string
+    add_column :users, :locked_at,       :datetime
+    add_index  :users, :unlock_token, unique: true
+  end
+end