♻️ 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/plugins/match-braces/prism-match-braces.min.css

@@ -1 +0,0 @@
-.token.punctuation.brace-hover,.token.punctuation.brace-selected{outline:solid 1px}.rainbow-braces .token.punctuation.brace-level-1,.rainbow-braces .token.punctuation.brace-level-5,.rainbow-braces .token.punctuation.brace-level-9{color:#e50;opacity:1}.rainbow-braces .token.punctuation.brace-level-10,.rainbow-braces .token.punctuation.brace-level-2,.rainbow-braces .token.punctuation.brace-level-6{color:#0b3;opacity:1}.rainbow-braces .token.punctuation.brace-level-11,.rainbow-braces .token.punctuation.brace-level-3,.rainbow-braces .token.punctuation.brace-level-7{color:#26f;opacity:1}.rainbow-braces .token.punctuation.brace-level-12,.rainbow-braces .token.punctuation.brace-level-4,.rainbow-braces .token.punctuation.brace-level-8{color:#e0e;opacity:1}