* feat(db): add AT Protocol stats columns to users table * feat(profile-sync): capture AT Protocol stats and Bluesky detection * feat(sanitize): add display name sanitization during profile sync * feat(profiles): add community-scoped activity, votesReceived, and AT Protocol stats * fix(db): add migration journal entry for AT Protocol stats columns The migration file was created but the Drizzle journal entry was missing, causing drizzle-kit migrate to skip it in CI.