Add MemberDirectory seam and cloud membership mirror tables

[RhysSullivan]

Layer 1 of 5. No behavior change on its own.

• New shared read seam MemberDirectory in @executor-js/api/server (membership, membershipsOf, membershipById, members with search and paging, membersById, findByEmail) plus adminUserDirectoryFromMembers.
• Self-host adapter over the Better Auth member and user tables.
• Cloud: accounts gains profile columns; memberships gains the WorkOS membership id, role, status, workos_updated_at, and deleted_at; new membership_tombstones ledger keyed by WorkOS membership id; new workos_sync row. Migration 0018.
• Cloud WorkOsMirror write service. Deletes are identity facts: a deleted membership id never comes back, a replacement under a new id takes over. Every write is guarded by the WorkOS updated_at so replays and late events converge. Cloud adapter over the mirror. Neither is wired into consumers yet.

Reviewed by three Claude lenses per layer plus eight Codex rounds over the whole stack. Verified: repo typecheck, lint, format check, and the cloud, self-host, core api, sdk, and react vitest suites pass on the stack top.

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