SOL-VENUS-N human reference for access requests

Elazar directive 2026-08-07: access requests get a human-facing reference like support tickets do. DB: accessRequests.requestNumber int8 sequence-backed, backfilled in createdAt order, unique; both dependent views (vActiveAccessRequests, vOpenAccessRequests) recreated since their columns are frozen at CREATE. App: formatRequestNumber() -> SOL-VENUS-N in src/lib/format.ts, surfaced on the admin list card, the detail header, the list search predicate (both prefixed and bare number), and the soporte-cron backlog digest. Format is SOL-VENUS-N not the sketched SOL-VE-####, matching the VENUS-249 fleet all-caps self-identifying convention used by SOP-VENUS-N; no zero-padding, same as tickets. Class-A (schema) so audit design-ping + diff review both apply. Migration venus67 must be APPLIED BEFORE the code pushes.