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/components/onboarding/WorkflowGuide.tsx

@@ -148,18 +148,16 @@ export default function WorkflowGuide({ onSiteAdded }: WorkflowGuideProps) {
     try {
       setIsCreatingSite(true);
       
-      // Create site with user-provided name and domain
+      // Create site with user-provided name, domain, and industry
       const newSite = await createSite({
         name: siteName.trim(),
         domain: websiteAddress.trim() || undefined,
         is_active: true,
         hosting_type: 'wordpress',
+        industry: selectedIndustry.id, // Include industry ID - required by backend
       });
 
-      // Set industry for the site (if API supports it during creation, otherwise update)
-      // For now, we'll set it via selectSectorsForSite which also sets industry
-      
-      // Select sectors for the site (this also sets the industry)
+      // Select sectors for the site
       await selectSectorsForSite(
         newSite.id,
         selectedIndustry.slug,