chore: replace mario.dev references with belco.dev

[Copilot]

Checks

• I have read the contributing guidelines.

Changes

• Replace mario.dev → belco.dev in .all-contributorsrc (contributor profile URL)
• Replace mario.dev → belco.dev in README.md (contributors table link)
• Replace mario.dev → belco.dev in package.json (author field)

Context

Updates the author/contributor domain across the project to reflect the new personal domain.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.35%. Comparing base (74ce9dd) to head (397eeb2).
⚠️ Report is 15 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1261   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files          49       49           
  Lines        6012     6012           
  Branches     1538     1538           
=======================================
  Hits         5853     5853           
  Misses        157      157           
  Partials        2        2           

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[github-actions]

🎉 This PR is included in version 7.16.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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