Add SEO Score API

[SeoScoreAPI]

Hi! I would like to suggest adding SEO Score API to the list.

SEO Score API — REST API that audits any URL for SEO issues. Returns a 0-100 score with 28 checks.

• Website: https://seoscoreapi.com
• API Docs: https://seoscoreapi.com/docs
• Free tier: 5 audits/day
• GitHub Action: https://github.com/SeoScoreAPI/seo-audit-action

Suggested category: Site Audit / Technical SEO

Would fit well alongside the other SEO audit tools in the list. Happy to submit a PR instead if preferred.