Add missing updated_at column to staff_activities migration

database/migrations/2026_05_02_000001_create_staff_activities_table.php

@@ -18,6 +18,7 @@ return new class extends Migration
             $table->string('ip_address', 45)->nullable();
             $table->json('metadata')->nullable();
             $table->timestamp('created_at')->useCurrent()->index();
+            $table->timestamp('updated_at')->nullable();
         });
     }