Fixed getChatSettings endpoint in openaiController.php — PHP warnings for undefined $domainsite_params (added global), undefined ai_name key (added ?? fallback), uninitialized $data array. These warnings corrupted the JSON response causing Domain Billing list to show infinite Loading spinner. Tested all 5 real AJAX endpoints: listProjects (clean), getChatSettings (fixed), getPercentageTable (clean), getAvailableModels (clean), getAllModules (clean). Screenshotted all 4 tabs: AI Projects (5 projects), Domain Billing (5 domains loaded), Modules (Events/Email Blast/FAQ with AI toggles), Balance Alerts (DataTable with 5 thresholds). Zero PHP errors, zero JS errors on both page routes.