feat: Enhance ticketing system with categories, templates, SLA tracking, and fix frontend integration

- Add ticket categories (billing, technical, feature_request, etc.) with type-specific options
- Add TicketTemplate and CannedResponse models for quick ticket creation
- Implement SLA tracking with due_at and first_response_at fields
- Add is_platform_admin and is_customer helper functions to fix permission checks
- Register models in Django admin with filters and fieldsets
- Enhance signals with error handling for WebSocket notifications
- Fix frontend API URLs for templates and canned responses
- Update PlatformSupport page to use real ticketing API
- Add comprehensive i18n translations for all ticket fields

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/src/hooks/useBusiness.ts

@@ -46,6 +46,7 @@ export const useCurrentBusiness = () => {
         initialSetupComplete: data.initial_setup_complete,
         websitePages: data.website_pages || {},
         customerDashboardContent: data.customer_dashboard_content || [],
+        paymentsEnabled: data.payments_enabled ?? false,
         // Platform-controlled permissions
         canManageOAuthCredentials: data.can_manage_oauth_credentials || false,
       };