♻️ 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/aria-query/lib/etc/roles/literal/treeitemRole.js

@@ -1,27 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
-  value: true
-});
-exports.default = void 0;
-var treeitemRole = {
-  abstract: false,
-  accessibleNameRequired: true,
-  baseConcepts: [],
-  childrenPresentational: false,
-  nameFrom: ['author', 'contents'],
-  prohibitedProps: [],
-  props: {
-    'aria-expanded': null,
-    'aria-haspopup': null
-  },
-  relatedConcepts: [],
-  requireContextRole: ['group', 'tree'],
-  requiredContextRole: ['group', 'tree'],
-  requiredOwnedElements: [],
-  requiredProps: {
-    'aria-selected': null
-  },
-  superClass: [['roletype', 'structure', 'section', 'listitem'], ['roletype', 'widget', 'input', 'option']]
-};
-var _default = exports.default = treeitemRole;