Remove schema objects that are no longer referenced by any query code,
GraphQL resolver, or frontend and only survive in old migration files:
- users_organizations: superseded by iam_memberships (data was migrated in
20251006T220024Z).
- organizations.logo_object_key: pre-files-table logo storage; replaced by
logo_file_id / horizontal_logo_file_id (data migrated in 20251009T140000Z).
- trust_center_accesses.has_accepted_non_disclosure_agreement,
has_accepted_non_disclosure_agreement_metadata, nda_file_id and
last_token_expires_at: the NDA-acceptance flow now uses
electronic_signature_id together with the state column.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
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