feat: add JSON leaderboard API endpoints

[standujar]

Add JSON Leaderboard API Endpoints

Summary

This PR adds static JSON API endpoints for leaderboard data, enabling external applications, mobile apps, and third-party integrations to consume leaderboard information programmatically.

Features

• Three time periods: Monthly, weekly, and lifetime leaderboards
• Comprehensive scoring: Includes total score plus breakdown by contribution type (PR, issue, review, comment)
• Wallet addresses: Includes Solana and Ethereum wallet addresses from GitHub profiles
• Calendar-based periods:
  • Weekly: Sunday to today
  • Monthly: 1st of month to today
  • Lifetime: Project start date to today
• CLI command: bun run pipeline export-leaderboard
• CI/CD integration: Automatically generates fresh leaderboard data on every deployment
• Full test coverage: 9 comprehensive tests covering all scenarios

API Endpoints

The following static JSON files will be available via GitHub Pages:

• /data/api/leaderboard-monthly.json
• /data/api/leaderboard-weekly.json
• /data/api/leaderboard-lifetime.json

Response Format

{
  "period": "monthly",
  "startDate": "2025-10-01",
  "endDate": "2025-10-23",
  "generatedAt": "2025-10-23T11:12:25.933Z",
  "totalUsers": 150,
  "leaderboard": [
    {
      "rank": 1,
      "username": "contributor1",
      "avatarUrl": "https://avatars.githubusercontent.com/...",
      "score": 1234.5,
      "prScore": 800.0,
      "issueScore": 200.0,
      "reviewScore": 150.5,
      "commentScore": 84.0,
      "wallets": {
        "solana": "9xQeWvG816bUx9EPjHmaT23yvVM2ZWbrrpZb9PusVFin",
        "ethereum": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb"
      }
    }
  ]
}

Use Cases

• Mobile apps: Display leaderboard data in native applications
• Discord bots: Show contributor rankings and stats
• Analytics dashboards: Track contributor engagement over time
• Reward systems: Automate token distributions based on rankings
• Third-party integrations: Enable community-built tools and services

Testing

All tests pass successfully:

• bun test src/lib/pipelines/export/exportLeaderboardAPI.test.ts

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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