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

.gitignore

@@ -1,39 +1 @@
-# dependencies
-/node_modules
-/.pnp
-.pnp.js
-.yarn/install-state.gz
-
-# testing
-/coverage
-
-# next.js
-/.next/
-/out/
-
-# production
-/build
-
-# misc
-.DS_Store
-*.pem
-
-# debug
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-
-# local env files
-.env*.local
-.env
-
-# vercel
-.vercel
-
-# typescript
-*.tsbuildinfo
-next-env.d.ts
-
-# IDE
-.idea/
-.vscode/
+.node-version