Add dni column to admin alumnos-import template (headerMap in alumnos-import-actions.ts reads only nombre/apellido/email/cohort → new rows import NULL dni)

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• wi-cli-venus created · 2026-06-26
• wi-cli-venus completed · 2026-07-02
  DNI column wired through alumnos Excel import (template + parse + preview); no schema change, backward-compatible. SHA 8e5f453