Adds migration 0009_relay_access.sql with the relay_accounts and
relay_event_queue DDL, completing the schema tracking for the relay
whitelist feature. The Drizzle schema and all service/route code were
already on main; this migration makes the table definitions explicit
for environments using SQL-based migrations.
Fixes#47
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
