feat(import): #11-14 router import Treapta 2 — upload+staging+mapare+preview+commit+export
Implementeaza app/api/v1/import_router.py (router nou, montat in app):
POST /v1/import — upload xlsx/csv, staging in import_batches/import_rows,
PII criptat Fernet (Issue 5a), BEGIN IMMEDIATE+executemany (Issue 6),
purge_after 90z (T16), sugestii fuzzy coloane DRY (Issue 5b/Eng#4),
detectie drift semnatura (T4/D3), multisheet support
GET/POST /v1/import/{id}/column-mapping — mapare coloane per cont cu
semnatura + drift detection
GET /v1/import/{id}/preview — 6 stari per rand (ok/needs_mapping/needs_data/
needs_review/already_sent/duplicate_in_file), already_sent batch lookup
nu N+1 (Eng#5), intra-batch collision EXCLUSIV preview (OV-3/T11)
POST /v1/import/{id}/commit — gate HARD N confirmat (T5/D3), atestare pe
valori (Voce#1), INSERT ON CONFLICT DO NOTHING TOCTOU (Issue 1/T12),
import_attestations rows_hash+n_confirmed (Voce#9), batch_id/row_index (T7)
GET /v1/import/{id}/export-failed — CSV randuri esuate cu motiv (T8)
Teste: 36 cazuri noi in tests/test_import_api.py; 243 total, toate verzi.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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