♻️ 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/cli/install-package.d.ts

@@ -1,10 +0,0 @@
-import type { Logger } from '../core/logger/core.js';
-type GetPackageOptions = {
-    skipAsk?: boolean;
-    optional?: boolean;
-    cwd?: string;
-};
-export declare function getPackage<T>(packageName: string, logger: Logger, options: GetPackageOptions, otherDeps?: string[]): Promise<T | undefined>;
-export declare function fetchPackageJson(scope: string | undefined, name: string, tag: string): Promise<Record<string, any> | Error>;
-export declare function fetchPackageVersions(packageName: string): Promise<string[] | Error>;
-export {};