After adding require_admin to admin endpoints, tests using
unauthenticated client or auth_client got 401/403. Also fix mock user
ID to be a valid UUID (was "test-user-123", now a proper UUID4).
- Add admin_override and admin_client fixtures to conftest
- Update test_pokemon.py, test_games.py, test_genlocke_boss.py to use
admin_client for write operations on admin endpoints
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
