Add AvailableMission (extends Mission with estimatedSuccessChance,
canStart), AbandonMissionResponse type. Extend Mission with description,
minLevel, rewardItemName/Quantity; ClaimMissionResponse with moneyChange,
fine, lootItem fields; City with mapX/mapY; MarketEntry with basePrice.
Add abandonMission() API call.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add JWT-based AuthContext (login/logout, token persistence), typed
HTTP client with auth header injection, REST API functions for all
game endpoints, and shared TypeScript types.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
davide