feat: add OSS Worth across GitHub and Stack Overflow

[sajeetharan]

Summary

• add a versioned OSS Worth calculator using fictional OSS Credits
• allocate a strict 60% maximum to GitHub and 40% to Stack Overflow without redistributing missing SO data
• show separate GitHub and Stack Overflow cards with source values, weights, caps, and formula version
• add compact OSS Worth values and deterministic Worth sorting to the leaderboard
• expose the additional public metrics required by the shared calculator

Formula

• GitHub: stars, commits, repository reach, followers, and public repositories; maximum 600,000 OSC
• Stack Overflow: reputation, accepted-answer estimate, and badges; maximum 400,000 OSC
• Combined maximum: 1,000,000 OSC
• Fixed log-normalization caps keep results stable as the indexed cohort changes

Testing

• npm test (130 passed)
• npm run build
• desktop browser: two cards, disclaimer, compact leaderboard value, and descending Worth sort verified
• 390px production browser: cards stack, no section/page overflow, and leaderboard rows remain 62px

Closes #185

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