♻️ 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/vite-plugin-html/index.d.ts

@@ -1,8 +0,0 @@
-export default function html(): {
-    name: string;
-    options(options: any): void;
-    transform(source: string, id: string): Promise<{
-        code: string;
-        map: import("magic-string").SourceMap;
-    } | undefined>;
-};