♻️ 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
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✅ 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-firestore-security-rules.min.js

@@ -1 +0,0 @@
-Prism.languages["firestore-security-rules"]=Prism.languages.extend("clike",{comment:/\/\/.*/,keyword:/\b(?:allow|function|if|match|null|return|rules_version|service)\b/,operator:/&&|\|\||[<>!=]=?|[-+*/%]|\b(?:in|is)\b/}),delete Prism.languages["firestore-security-rules"]["class-name"],Prism.languages.insertBefore("firestore-security-rules","keyword",{path:{pattern:/(^|[\s(),])(?:\/(?:[\w\xA0-\uFFFF]+|\{[\w\xA0-\uFFFF]+(?:=\*\*)?\}|\$\([\w\xA0-\uFFFF.]+\)))+/,lookbehind:!0,greedy:!0,inside:{variable:{pattern:/\{[\w\xA0-\uFFFF]+(?:=\*\*)?\}|\$\([\w\xA0-\uFFFF.]+\)/,inside:{operator:/=/,keyword:/\*\*/,punctuation:/[.$(){}]/}},punctuation:/\//}},method:{pattern:/(\ballow\s+)[a-z]+(?:\s*,\s*[a-z]+)*(?=\s*[:;])/,lookbehind:!0,alias:"builtin",inside:{punctuation:/,/}}});