♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
✅ Cookie consent banner included
✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/@shikijs/themes/dist/index.mjs

@@ -1,67 +0,0 @@
-export const themeNames = [
-  'andromeeda',
-  'aurora-x',
-  'ayu-dark',
-  'ayu-light',
-  'ayu-mirage',
-  'catppuccin-frappe',
-  'catppuccin-latte',
-  'catppuccin-macchiato',
-  'catppuccin-mocha',
-  'dark-plus',
-  'dracula',
-  'dracula-soft',
-  'everforest-dark',
-  'everforest-light',
-  'github-dark',
-  'github-dark-default',
-  'github-dark-dimmed',
-  'github-dark-high-contrast',
-  'github-light',
-  'github-light-default',
-  'github-light-high-contrast',
-  'gruvbox-dark-hard',
-  'gruvbox-dark-medium',
-  'gruvbox-dark-soft',
-  'gruvbox-light-hard',
-  'gruvbox-light-medium',
-  'gruvbox-light-soft',
-  'horizon',
-  'horizon-bright',
-  'houston',
-  'kanagawa-dragon',
-  'kanagawa-lotus',
-  'kanagawa-wave',
-  'laserwave',
-  'light-plus',
-  'material-theme',
-  'material-theme-darker',
-  'material-theme-lighter',
-  'material-theme-ocean',
-  'material-theme-palenight',
-  'min-dark',
-  'min-light',
-  'monokai',
-  'night-owl',
-  'night-owl-light',
-  'nord',
-  'one-dark-pro',
-  'one-light',
-  'plastic',
-  'poimandres',
-  'red',
-  'rose-pine',
-  'rose-pine-dawn',
-  'rose-pine-moon',
-  'slack-dark',
-  'slack-ochin',
-  'snazzy-light',
-  'solarized-dark',
-  'solarized-light',
-  'synthwave-84',
-  'tokyo-night',
-  'vesper',
-  'vitesse-black',
-  'vitesse-dark',
-  'vitesse-light',
-]