Add MackDing community skill repositories

[MackDing]

Summary

• Add three MackDing community skill repositories to data/skills.json and public/data/skills.json
• Update README skill counts and source summary
• Include AI-Native Founder Playbook, Andrej Karpathy Coding Guidelines ZH, and Skill Usage

Notes

The added repositories cover startup/founder workflows, Chinese AI coding-agent rules, and skill usage monitoring for OpenClaw, Hermes-Agent, Claude Code, and Codex.

[vercel]

@MackDing is attempting to deploy a commit to the zw7000727-gmailcom's projects Team on Vercel.

A member of the Team first needs to authorize it.

[MackDing]

Quick follow-up: this PR appears mergeable from my side, and I do not see a failing required check. Happy to make any maintainer-preferred tweak if needed.

[MackDing]

This PR is still blocked by a Vercel status failure that appears to be repository/integration-side rather than a code conflict in this branch.

Could a maintainer rerun or advise whether the Vercel integration needs to be re-authorized?

[MackDing]

Thanks for considering this contribution. This branch has accumulated conflicts and the repository-side Vercel authorization check remains blocked, while there has not been maintainer guidance on the intended integration path. I am closing it to keep the PR queue tidy and can resubmit a current, narrower change if contributions are being reviewed again.