feat(docs): add chrome-free embeddable architecture diagram page

Koushik Kumaranrequested to merge
embed-architecture-diagram into main

Generates docs/embed/architecture.html at build time from the same SVG and capability-list content as the landing page, so external sites (e.g. the company website) can iframe it directly instead of relying on the GitLab API or a static screenshot.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

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