♻️ 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/components/prism-php-extras.js

@@ -1,14 +0,0 @@
-Prism.languages.insertBefore('php', 'variable', {
-	'this': {
-		pattern: /\$this\b/,
-		alias: 'keyword'
-	},
-	'global': /\$(?:GLOBALS|HTTP_RAW_POST_DATA|_(?:COOKIE|ENV|FILES|GET|POST|REQUEST|SERVER|SESSION)|argc|argv|http_response_header|php_errormsg)\b/,
-	'scope': {
-		pattern: /\b[\w\\]+::/,
-		inside: {
-			'keyword': /\b(?:parent|self|static)\b/,
-			'punctuation': /::|\\/
-		}
-	}
-});