♻️ 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/prerender/utils.d.ts

@@ -1,11 +0,0 @@
-import type { AstroSettings } from '../types/astro.js';
-import type { AstroConfig } from '../types/public/config.js';
-export declare function getPrerenderDefault(config: AstroConfig): boolean;
-/**
- * Returns the correct output directory of the SSR build based on the configuration
- */
-export declare function getServerOutputDirectory(settings: AstroSettings): URL;
-/**
- * Returns the correct output directory of the client build based on the configuration
- */
-export declare function getClientOutputDirectory(settings: AstroSettings): URL;