♻️ 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/unist-util-visit-children/index.d.ts

@@ -1,3 +0,0 @@
-export { visitChildren } from "./lib/index.js";
-export type Visitor<Kind extends import("unist").Parent> = import('./lib/index.js').Visitor<Kind>;
-export type Visit<Kind extends import("unist").Parent> = import('./lib/index.js').Visit<Kind>;