Admin protetto, dashboard KPI e aggiornamenti sito marketing.

Login admin con cambio password, metriche server (CPU/RAM/disco/banda), grafici e statistiche streaming; sezione piani ridimensionata.

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

backend/app/controllers/admin/base_controller.rb

@@ -1,6 +1,30 @@
 module Admin
   class BaseController < ActionController::Base
     layout "admin"
-    protect_from_forgery with: :null_session
+    protect_from_forgery with: :exception
+
+    before_action :require_admin_login
+
+    include ::AdminHelper
+    helper_method :current_admin_account, :admin_logged_in?
+
+    private
+
+    def require_admin_login
+      return if admin_logged_in?
+
+      session[:admin_return_to] = request.fullpath unless request.path == admin_login_path
+      redirect_to admin_login_path, alert: "Accedi per continuare"
+    end
+
+    def current_admin_account
+      return unless session[:admin_account_id]
+
+      @current_admin_account ||= AdminAccount.find_by(id: session[:admin_account_id])
+    end
+
+    def admin_logged_in?
+      current_admin_account.present?
+    end
   end
 end