Fix invoice file 500 and pdf.worker MIME error

- Remove stale import of non-existent require_cap_from_token from
  get_invoice_file endpoint — caused ImportError → 500 on every PDF load
- Fix pdf.js worker path from '/pdf.worker.min.mjs' to '/kitchen/pdf.worker.min.mjs'
  in Review.tsx and SearchDefinitions.tsx — worker was being fetched from domain
  root instead of under the /kitchen/ base, causing MIME type rejection

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/api/invoices.py

@@ -1237,7 +1237,6 @@ async def get_invoice_file(
     db: AsyncSession = Depends(get_db)
 ):
     """Get invoice file (image or PDF) with token in query param - works through proxies"""
-    from auth import get_current_user, require_cap_from_token
     from starlette.responses import Response
     from services.file_archival_service import FileArchivalService