feat: add opt-in contributor leaderboard

[Peolite1]

Closes #75

Description

This PR introduces the Contributor Leaderboard to recognize the amazing people who build Wraith Protocol. The leaderboard provides an easy way for contributors to opt-out if they prefer anonymity for privacy or job-search reasons.

Changes Included

• New /contributors Route: Created a new page (src/pages/Contributors.tsx) that displays contributor cards linking to their GitHub profiles.
• Data Generation Script: Added scripts/gen-contributors.mjs, which can be run manually or weekly via CI to query the GitHub API for PR counts and wave participation.
• Opt-out Support: Added src/data/contributors-optout.json. Contributors listed in this file are completely excluded from the generated leaderboard data.
• Dummy Data: Provided initial dummy data in src/data/contributors.json so the frontend builds and renders properly before the script is run for the first time.

Acceptance Criteria Met

• Opt-out entries never appear on the leaderboard.
• Script is documented and runnable manually.
• Refresh cadence (weekly) is stated clearly on the page.
• Contributor cards link directly to GitHub profiles.

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[truthixify]

Merged. Thanks @Peolite1 — clean opt-in leaderboard implementation, appreciate the care with the a11y attributes.