Add static site generator, responsive UI, Arabic i18n, and optional translation proxy

[K1SysAdmin]

Motivation

• Provide a maintainable source-driven static site workflow and replace hand-edited /docs HTML with generated output and a simple Python-based build tool.
• Add a modern responsive UI, language controls, and curated Arabic localization to support bilingual presentation and machine translation tooling.
• Offer an optional serverless proxy pattern so machine-translation provider keys remain server-side and are not exposed to browser JavaScript.

Description

• Add a dependency-free static site generator scripts/build_site.py plus a site manifest site/site_manifest.json and HTML template site/templates/page.html to render Markdown from source/quartz-content-vault into /docs.
• Introduce a large UI refresh in docs/assets/site.css and interactive controls in docs/assets/site.js that implement theme switching, language switching (en/ar), audience pathway injection, and a machine-translation trigger using an optional proxy.
• Add Arabic localization catalogs site/i18n/ar.json and docs/assets/i18n.ar.json, curated translated text, and several new content pages in source/quartz-content-vault plus updated FILE_INVENTORY.md and an expanded README_DEPLOY.md with build/deploy instructions.
• Provide an optional serverless translation proxy example under serverless/translate-proxy/ including worker.js and README.md that demonstrates safely proxying translations to DeepL with CORS and basic payload handling.

Testing

• Performed a local validation build using python3 scripts/build_site.py --clean which generated pages into docs/, produced docs/assets/search-index.json, and completed without errors.
• Confirmed site.js boots controls on DOMContentLoaded and that theme/locale choices are persisted to localStorage during manual smoke testing in a browser.

---

Codex Task