♻️ 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/astro/dist/assets/utils/getAssetsPrefix.js

@@ -1,15 +0,0 @@
-function getAssetsPrefix(fileExtension, assetsPrefix) {
-  let prefix = "";
-  if (!assetsPrefix) {
-    prefix = "";
-  } else if (typeof assetsPrefix === "string") {
-    prefix = assetsPrefix;
-  } else {
-    const dotLessFileExtension = fileExtension.slice(1);
-    prefix = assetsPrefix[dotLessFileExtension] || assetsPrefix.fallback;
-  }
-  return prefix;
-}
-export {
-  getAssetsPrefix
-};