The sign-in experience must always include both email+password and
username+password methods. The admin user signs in with their email
(admin@company.com) which the sign-in UI detects as email type.
With only username method enabled, Logto rejects it with "this
sign-in method is not activated."
Fixes both bootstrap Phase 8c and EmailConnectorService disable path.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>