Introduce async business card import flow:
- MinIO object storage for card images (separate buckets for attachments and card visits with presigned URL access)
- Kafka topics for card visit processing with DLQ and retry config
- OCA OCR service integration (Qwen2.5-VL) with mock mode for local development
- New ocr-worker service with dedicated worker-entrypoint.sh
- Card import API endpoints and data parsing with guards against schema echo and legacy numbered contact formats
- CI pipeline updated to deploy ocr-worker alongside backend