Adds 8 TestCase entries to Authenticated_route_resolves for all
arena_two_pick and arena_two_pick_battle endpoints, and a full
integration test exercising entry → class_choose → 15×card_choose →
retire, verifying seed reward grants (1 ticket + 100 rupies).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
