fix: resolve onboarding session not found warnings and frontend build OOM

- Use canonical Clerk user id (clerk_user_id) across all onboarding entrypoints to ensure consistent OnboardingSession.user_id lookup
- Fix API key persistence in api_key_manager.py to use correct APIKey model columns (session_id, provider, key)
- Increase Node heap for frontend build to 8GB and add build:nomap script to disable sourcemaps and reduce memory usage
- Update onboarding endpoints (endpoints_core.py, onboarding_control_service.py, step_management_service.py) to prefer clerk_user_id over id
- Fix frontend workflowStore.ts TypeScript error by returning WorkflowError instance
- Add website_automation_service.py for onboarding automation

backend/api/onboarding_utils/onboarding_control_service.py

@@ -22,7 +22,7 @@ class OnboardingControlService:
         db_gen = get_db()
         db = next(db_gen)
         try:
-            user_id = str(current_user.get('id'))
+            user_id = str(current_user.get('clerk_user_id') or current_user.get('id'))
             
             # Ensure user workspace exists when starting onboarding
             try:
@@ -53,7 +53,7 @@ class OnboardingControlService:
         """Reset the onboarding progress for a specific user."""
         try:
             from services.onboarding.progress_service import OnboardingProgressService
-            user_id = str(current_user.get('id'))
+            user_id = str(current_user.get('clerk_user_id') or current_user.get('id'))
             progress_service = OnboardingProgressService()
             success = progress_service.reset_onboarding(user_id)