♻️ 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-diff.min.js

@@ -1 +0,0 @@
-!function(e){e.languages.diff={coord:[/^(?:\*{3}|-{3}|\+{3}).*$/m,/^@@.*@@$/m,/^\d.*$/m]};var n={"deleted-sign":"-","deleted-arrow":"<","inserted-sign":"+","inserted-arrow":">",unchanged:" ",diff:"!"};Object.keys(n).forEach((function(a){var i=n[a],r=[];/^\w+$/.test(a)||r.push(/\w+/.exec(a)[0]),"diff"===a&&r.push("bold"),e.languages.diff[a]={pattern:RegExp("^(?:["+i+"].*(?:\r\n?|\n|(?![\\s\\S])))+","m"),alias:r,inside:{line:{pattern:/(.)(?=[\s\S]).*(?:\r\n?|\n)?/,lookbehind:!0},prefix:{pattern:/[\s\S]/,alias:/\w+/.exec(a)[0]}}}})),Object.defineProperty(e.languages.diff,"PREFIXES",{value:n})}(Prism);