Commit iniziale di eminuxCRM: CRM Rails con pipeline, campagne email e Docker.

Include autenticazione, progetti isolati, mail marketing HTML con SMTP, test A/B e editor WYSIWYG.

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

app/controllers/concerns/authentication.rb

@@ -0,0 +1,52 @@
+module Authentication
+  extend ActiveSupport::Concern
+
+  included do
+    before_action :require_login
+    helper_method :current_user, :logged_in?
+  end
+
+  private
+
+  def current_user
+    @current_user ||= session[:user_id] ? User.find_by(id: session[:user_id]) : nil
+  end
+
+  def logged_in?
+    current_user.present? && current_user.active?
+  end
+
+  def require_login
+    if current_user.present? && !current_user.active?
+      logout
+      redirect_to login_path, alert: "Il tuo account è stato disabilitato."
+      return
+    end
+    return if logged_in?
+
+    redirect_to login_path, alert: "Effettua l'accesso per continuare."
+  end
+
+  def require_admin
+    return if current_user&.admin? && current_user.active?
+
+    redirect_to root_path, alert: "Accesso riservato agli amministratori."
+  end
+
+  def login_as(user)
+    reset_session
+    session[:user_id] = user.id
+    @current_user = user
+    Current.user = user
+  end
+
+  def logout
+    reset_session
+    @current_user = nil
+    Current.user = nil
+  end
+
+  def set_current_user
+    Current.user = current_user
+  end
+end