♻️ 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/prismjs/components/prism-prolog.min.js

@@ -1 +0,0 @@
-Prism.languages.prolog={comment:{pattern:/\/\*[\s\S]*?\*\/|%.*/,greedy:!0},string:{pattern:/(["'])(?:\1\1|\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1(?!\1)/,greedy:!0},builtin:/\b(?:fx|fy|xf[xy]?|yfx?)\b/,function:/\b[a-z]\w*(?:(?=\()|\/\d+)/,number:/\b\d+(?:\.\d*)?/,operator:/[:\\=><\-?*@\/;+^|!$.]+|\b(?:is|mod|not|xor)\b/,punctuation:/[(){}\[\],]/};