feat: Migrate Astro to root - Replace Next.js completely
- Removed Next.js project (src, app, components, etc.)
- Moved Astro from dealplustech-astro/ to root
- Updated Dockerfile for Astro root deployment
- All PDPA compliance features preserved:
* Cookie consent banner
* Consent logging API with SQLite
* Admin dashboard (/admin/consent-logs)
* Privacy Policy (Thai, PDPA-compliant)
* Terms & Conditions (Thai)
- 15 pages: homepage, 6 products, 3 blog posts, legal pages, admin
- Build: 660ms, all pages generated successfully
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