♻️ 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-json5.min.js

@@ -1 +0,0 @@
-!function(n){var e=/("|')(?:\\(?:\r\n?|\n|.)|(?!\1)[^\\\r\n])*\1/;n.languages.json5=n.languages.extend("json",{property:[{pattern:RegExp(e.source+"(?=\\s*:)"),greedy:!0},{pattern:/(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\s*:)/,alias:"unquoted"}],string:{pattern:e,greedy:!0},number:/[+-]?\b(?:NaN|Infinity|0x[a-fA-F\d]+)\b|[+-]?(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:[eE][+-]?\d+\b)?/})}(Prism);