Add API client docs, env vars, and quest system to engage-native page

[mintlify]

Summary

Updates repositories/d-sports-engage-native.mdx to reflect the initial commit of the d-sports-engage-native repository (d-sports-ecosystem/d-sports-engage-native@4e362d9).

Changes

• Added environment variables table listing all EXPO_PUBLIC_* keys required to run the app
• Documented the API client architecture (lib/api/client.ts) including the normalized ApiResponse<T> envelope and useApi() hook
• Added a complete API modules reference table covering all 10 modules (user, quests, leaderboard, wallet, lockerRoom, teams, collectibles, shop, checkout)
• Documented the quest and rewards system — multi-step quests, daily visits, check-progress, and rewards claiming
• Added a note on the Phase 2 API normalization migration (hybrid legacy/normalized handling in client.ts)
• Converted getting-started steps to use the <Steps> component
• Updated the features list to include quests/rewards and expanded leaderboard/locker room descriptions

Trigger

Merge to main in d-sports-engage-native: feat: align native quest api and batch b docs

Files changed in trigger repo (key files)

• lib/api/quests-api.ts — quest types (QuestStatus, CheckProgressResponse, DailyVisitResponse), rewards endpoints
• lib/api/client.ts — normalized envelope parsing with legacy fallback
• lib/api/index.ts — barrel file with useApi() hook
• types/api.ts — centralized type re-exports
• .env — environment variable definitions
• All lib/api/*-api.ts modules (user, wallet, leaderboard, locker-room, checkout, teams, collectibles, shop)