Add MemberDirectory seam and cloud membership mirror tables

[RhysSullivan]

Layer 1 of 5 (stack #2008). No behavior change on its own.

• New shared read seam MemberDirectory in @executor-js/api/server (membership, members with search/paging, membersById, findByEmail) plus adminUserDirectoryFromMembers.
• Self-host adapter over the Better Auth member and user tables.
• Cloud: accounts gains profile columns, memberships gains WorkOS membership id, role, status, and updated_at; new workos_sync cursor table. Migration 0018.
• Cloud WorkOsMirror write service with updated_at guards and a compare-and-set cursor. Cloud adapter over the mirror. Neither is wired into consumers yet.

Verified: repo typecheck, lint, and the cloud, self-host, core api, and react vitest suites pass on the stack top.

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