Fixed 5 failing tests related to code_verifier column which was
added by migration 001 but removed by migration 003.
Changes:
- Renamed legacy_db_without_code_verifier to legacy_db_basic
- Updated column_exists tests to use 'state' column instead of 'code_verifier'
- Updated test_run_migrations_legacy_database to test with generic column
- Replaced test_actual_migration_001 with test_actual_migration_003
- Fixed test_dev_mode_requires_dev_admin_me to explicitly override DEV_ADMIN_ME
All 551 tests now passing.
Part of Phase 1 completion: IndieAuth authorization server removal
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Co-Authored-By: Claude <noreply@anthropic.com>