Refactor import and workflow services plus adapter seams

docs/batches/bat-012_20260703_import-pipeline-split/index.md

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+# BAT-012 Import pipeline split
+
+- Profile: standard
+- Status: release-candidate
+- Included REQ: REQ-016
+- Discovery: dcy-011
+- Owner: 렛저장인
+- Date (KST): 2026-07-03
+
+## 목표
+
+REQ-016에 따라 import preview/import/rollback 경로를 `application/imports_service.py`와 `infrastructure/parsers/*` 중심으로 재배치하고, `application/import_transfer_services.py`는 advanced workflow 중심 모듈로 축소한다.
+
+## Delivery checklist
+
+- [ ] planning complete
+- [ ] design complete
+- [ ] implementation complete
+- [ ] verification complete
+- [ ] release-candidate promoted
+- [ ] REQ sync complete