feat(multi-tenancy): implement critical fixes for orphaned users and permissions

- Simplified HasTenantAccess permission logic to ensure every authenticated user has an account.
- Added fallback to system account for OpenAI settings in AI configuration.
- Allowed any authenticated user to check task progress in IntegrationSettingsViewSet.
- Created a script to identify and fix orphaned users without accounts.
- Updated error response handling in business endpoints for clarity.

frontend/src/services/api.ts

@@ -1395,6 +1395,7 @@ export interface Site {
 
 export interface SiteCreateData {
   name: string;
+  industry?: number; // Industry ID - required by backend
   slug?: string;
   domain?: string;
   description?: string;
@@ -1403,6 +1404,7 @@ export interface SiteCreateData {
   wp_url?: string;
   wp_username?: string;
   wp_app_password?: string;
+  hosting_type?: string;
 }
 
 export interface SitesResponse {