Add GraphQL API layer for frontend queries

[big14way]

Create a GraphQL API that wraps contract queries for efficient frontend data fetching.

Acceptance Criteria:

• Set up GraphQL schema matching contract types
• Implement resolvers that call contract via SDK
• Support queries: group, groups, memberGroups, roundStatus
• Add DataLoader for batching contract calls
• Add subscriptions for real-time updates

Files: new directory graphql/, package.json

[big14way]

@robinshen36 youve been assigned

[lustsazeus-lab]

Nice scope. One thing that helps a lot early: make subscriptions an optional second phase, and first lock query consistency with DataLoader + explicit cache invalidation per resolver boundary.

That keeps the first release predictable and avoids realtime race issues before the schema settles.