chore: update repo references after rename to ocpp-debugkit/toolkit

[sepehr-safari]

Summary

Updates all internal references from the old repo URL
(github.com/ocpp-debugkit/ocpp-debugkit) to the new name
(github.com/ocpp-debugkit/toolkit) after the GitHub repository rename.

GitHub auto-redirects old URLs, but internal references should use the
new URL directly.

Files Updated

• README.md — badges, clone URL, GitHub link
• CONTRIBUTING.md — clone URL, issues links (2 occurrences)
• CODE_OF_CONDUCT.md — security advisory link
• SECURITY.md — security advisory link
• docs/migration.md — issues link
• packages/toolkit/README.md — spec link, repo link, migration link, issues link, license link
• packages/toolkit/package.json — repository, homepage, bugs URLs
• apps/web/README.md — repo link
• apps/web/src/app/page.tsx — GitHub footer links (2 occurrences)
• apps/web/src/app/docs/examples/page.tsx — examples link

What's NOT Changing

• npm package name: @ocpp-debugkit/toolkit (npm org scope, independent of repo name)
• GitHub org name: ocpp-debugkit
• Local remote URL (already updated)

Verification

• ✅ pnpm lint — passes
• ✅ pnpm format:check — passes
• ✅ pnpm typecheck — passes
• ✅ pnpm build — passes
• ✅ pnpm test — 371 tests pass
• ✅ Zero remaining references to old URL in tracked source files

Closes #112