♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/property-information/lib/util/case-insensitive-transform.js

@@ -1,13 +0,0 @@
-import {caseSensitiveTransform} from './case-sensitive-transform.js'
-
-/**
- * @param {Record<string, string>} attributes
- *   Attributes.
- * @param {string} property
- *   Property.
- * @returns {string}
- *   Transformed property.
- */
-export function caseInsensitiveTransform(attributes, property) {
-  return caseSensitiveTransform(attributes, property.toLowerCase())
-}