Add Fresh SEM SEO audit and marketing services resource

[scosemicolon]

Suggestion for the list:

• Fresh SEM: SEO audit and AI website audit services covering technical SEO, crawlability, metadata, content quality, backlink risk, page speed, AI readiness, and search visibility.

Useful links:

• Audit service: https://freshsem.com/audit
• Services overview: https://freshsem.com/services
• Growth review form: https://freshsem.com/prospect-form
• Affiliate program: https://freshsem.com/affiliate

Potential fit: technical SEO or miscellaneous SEO resources. I checked the repo issues/PRs and did not see an existing Fresh SEM suggestion.