♻️ 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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✅ 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/visible.prebuilt.d.ts

@@ -1,7 +0,0 @@
-/**
- * This file is prebuilt from packages/astro/src/runtime/client/visible.ts
- * Do not edit this directly, but instead edit that file and rerun the prebuild
- * to generate this file.
- */
-declare const _default: "(()=>{var a=(s,i,o)=>{let r=async()=>{await(await s())()},t=typeof i.value==\"object\"?i.value:void 0,c={rootMargin:t==null?void 0:t.rootMargin},n=new IntersectionObserver(e=>{for(let l of e)if(l.isIntersecting){n.disconnect(),r();break}},c);for(let e of o.children)n.observe(e)};(self.Astro||(self.Astro={})).visible=a;window.dispatchEvent(new Event(\"astro:visible\"));})();";
-export default _default;