Resolve team dependencies

Reassigns responsible employees, team assignments, and (where applicable) review-template reviewers for the items returned by GET /v1/teams/{team_id}/dependencies, so this team can safely be archived or deleted.

• team_ids may only be set when team_type is TEAM
• Boards have no review-link support, so review_data on board items is ignored
• Validation runs before any changes are applied: if any single item across any module is invalid, the whole request fails with 400 and nothing is updated
• Once validation passes, updates are applied in independently-committed phases rather than one big transaction, to limit database lock contention. This means a later phase failing can leave earlier phases applied; retrying the same request is safe since every phase always sets values to the submitted target state