♻️ 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/runtime/client/idle.prebuilt.d.ts

@@ -1,7 +0,0 @@
-/**
- * This file is prebuilt from packages/astro/src/runtime/client/idle.ts
- * Do not edit this directly, but instead edit that file and rerun the prebuild
- * to generate this file.
- */
-declare const _default: "(()=>{var l=(n,t)=>{let i=async()=>{await(await n())()},e=typeof t.value==\"object\"?t.value:void 0,s={timeout:e==null?void 0:e.timeout};\"requestIdleCallback\"in window?window.requestIdleCallback(i,s):setTimeout(i,s.timeout||200)};(self.Astro||(self.Astro={})).idle=l;window.dispatchEvent(new Event(\"astro:idle\"));})();";
-export default _default;