Generic CSV/JSON bulk import for registers

[topriko]

Problem / motivation

Onboarding a new org means migrating existing spreadsheets, risk registers, people rosters, control/asset lists. Today Probo can import frameworks and measures (JSON) and vendors (from a catalog), but there's no bulk importer for the risk register or people, so that migration is manual, row by row.

Proposed solution

A per-domain CSV/JSON bulk importer, starting with one register (risk register or people). Shape:

• a column-mapping step (spreadsheet columns → fields),
• server-side validate + dry-run with per-row error reporting,
• a bulkImport<Domain> GraphQL mutation (and/or a proboctl import subcommand),
• rows applied inside a transaction, reusing the existing per-entity create mutations.