♻️ 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-aspnet.min.js

@@ -1 +0,0 @@
-Prism.languages.aspnet=Prism.languages.extend("markup",{"page-directive":{pattern:/<%\s*@.*%>/,alias:"tag",inside:{"page-directive":{pattern:/<%\s*@\s*(?:Assembly|Control|Implements|Import|Master(?:Type)?|OutputCache|Page|PreviousPageType|Reference|Register)?|%>/i,alias:"tag"},rest:Prism.languages.markup.tag.inside}},directive:{pattern:/<%.*%>/,alias:"tag",inside:{directive:{pattern:/<%\s*?[$=%#:]{0,2}|%>/,alias:"tag"},rest:Prism.languages.csharp}}}),Prism.languages.aspnet.tag.pattern=/<(?!%)\/?[^\s>\/]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">=]+))?)*\s*\/?>/,Prism.languages.insertBefore("inside","punctuation",{directive:Prism.languages.aspnet.directive},Prism.languages.aspnet.tag.inside["attr-value"]),Prism.languages.insertBefore("aspnet","comment",{"asp-comment":{pattern:/<%--[\s\S]*?--%>/,alias:["asp","comment"]}}),Prism.languages.insertBefore("aspnet",Prism.languages.javascript?"script":"tag",{"asp-script":{pattern:/(<script(?=.*runat=['"]?server\b)[^>]*>)[\s\S]*?(?=<\/script>)/i,lookbehind:!0,alias:["asp","script"],inside:Prism.languages.csharp||{}}});