fix: new company defaults is_active=true

Creating a company with the Activa checkbox unchecked (or missing)
set is_active=0, silently disabling the bot for that company.
New companies now default to active; existing companies keep their
current value when the form loads.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin/DashboardController.php

@@ -1006,7 +1006,7 @@ HTML;
         $config_json       = $cv('config_json');
         $bot_type          = $company['bot_type'] ?? 'normal';
         $requires_approval = !empty($company['requires_approval']);
-        $is_active         = !empty($company['is_active']);
+        $is_active         = $isEdit ? !empty($company['is_active']) : true; // default active for new companies
         $erp_active_users  = (int)($company['erp_active_users'] ?? 0);
         $reqAprChecked     = $requires_approval ? 'checked' : '';
         $isActChecked      = $is_active ? 'checked' : '';