♻️ 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/transitions/router.d.ts

@@ -1,9 +0,0 @@
-import type { Fallback, Options } from './types.js';
-export declare const updateScrollPosition: (positions: {
-    scrollX: number;
-    scrollY: number;
-}) => void;
-export declare const supportsViewTransitions: boolean;
-export declare const transitionEnabledOnThisPage: () => boolean;
-export declare function getFallback(): Fallback;
-export declare function navigate(href: string, options?: Options): Promise<void>;