Adds VisaStatus enum, VisaApplication model 1:1 with AttendingMember
(cascade-delete), and Program.visaStatusVisibleToMembers Boolean
toggle. The model intentionally stores process metadata only — status,
optional nationality, key dates, free-text notes. Sensitive documents
(passport scans, invitation letters, decision papers) continue to flow
over email and are never persisted in the platform.
Migration is purely additive: CREATE TYPE / CREATE TABLE / ADD COLUMN /
ADD FK. No DROP / ALTER on existing data.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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