feat(announcements): add SEO metadata via server layout.tsx

[mvanhorn]

Resubmitting #1300 against dev per maintainer request.

Same change as before: single file adds Next.js App Router metadata export for the /announcements route (title, description, canonical URL, Open Graph, Twitter card tags).

File: surfsense_web/app/(home)/announcements/layout.tsx (+25 lines)

High-level PR Summary

This PR adds SEO metadata to the /announcements route by creating a new Next.js App Router layout file. The metadata includes page title, description, canonical URL, Open Graph tags, and Twitter card configuration to improve search engine optimization and social media sharing for the announcements page.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/app/(home)/announcements/layout.tsx

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