fix: resolve architecture validation errors and warnings

- Fix JS-008: Replace raw fetch() with apiClient in letzshop-vendor-directory.js
- Fix JS-005: Add init guard to letzshop-vendor-directory.js
- Fix JS-004: Increase search region in validator (800→2000 chars) to detect
  currentPage in files with setup code before return statement
- Fix JS-001: Use centralized logger in media-picker.js
- Fix API-002: Move database query from onboarding.py to order_service.py
- Fix FE-001: Add noqa comment to search.html (shop uses custom themed pagination)
- Add audit validator to validate_all.py script
- Update frontend.yaml with vendor exclusion pattern

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/api/v1/vendor/onboarding.py

@@ -237,16 +237,10 @@ def trigger_order_sync(
 
         # Store Celery task ID if using Celery
         if celery_task_id:
-            from models.database.letzshop import LetzshopHistoricalImportJob
+            from app.services.letzshop import LetzshopOrderService
 
-            job = (
-                db.query(LetzshopHistoricalImportJob)
-                .filter(LetzshopHistoricalImportJob.id == result["job_id"])
-                .first()
-            )
-            if job:
-                job.celery_task_id = celery_task_id
-                db.commit()
+            order_service = LetzshopOrderService(db)
+            order_service.update_job_celery_task_id(result["job_id"], celery_task_id)
 
         logger.info(f"Queued historical import task for job {result['job_id']}")