feat(import): T9 canonicalize_row + build_key partajat (idempotency)
- canonicalize_row: VIN upper, odometru strip ".0" (Excel float coercion),
data strip — INAINTE de validare si cheie (§3.4bis)
- build_key: aplica account_or_default(None->1) inainte de hash (OV-2):
canal API (None) si canal import (1) produc aceeasi cheie
- build_key_legacy: helper dual-lookup pentru randuri DB vechi (pre-T9)
- router.py: POST /v1/prezentari foloseste build_key(account_id, canonicalize_row(content))
- 14 teste: canonicalizare, cross-canal, dedup float/int odometru, legacy
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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