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/passwords_controller.rb

@@ -0,0 +1,30 @@
+module Admin
+  class PasswordsController < Admin::BaseController
+    def edit
+    end
+
+    def update
+      unless current_admin_account.authenticate(params[:current_password])
+        flash.now[:alert] = "Password attuale non corretta"
+        return render :edit, status: :unprocessable_entity
+      end
+
+      if params[:password].blank? || params[:password].length < 8
+        flash.now[:alert] = "La nuova password deve avere almeno 8 caratteri"
+        return render :edit, status: :unprocessable_entity
+      end
+
+      if params[:password] != params[:password_confirmation]
+        flash.now[:alert] = "Le password non coincidono"
+        return render :edit, status: :unprocessable_entity
+      end
+
+      if current_admin_account.update(password: params[:password])
+        redirect_to admin_root_path, notice: "Password aggiornata"
+      else
+        flash.now[:alert] = current_admin_account.errors.full_messages.to_sentence
+        render :edit, status: :unprocessable_entity
+      end
+    end
+  end
+end