♻️ 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/xmlns.js

@@ -1,9 +0,0 @@
-import {create} from './util/create.js'
-import {caseInsensitiveTransform} from './util/case-insensitive-transform.js'
-
-export const xmlns = create({
-  attributes: {xmlnsxlink: 'xmlns:xlink'},
-  properties: {xmlnsXLink: null, xmlns: null},
-  space: 'xmlns',
-  transform: caseInsensitiveTransform
-})