♻️ 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/vite-plugin-astro-server/css.d.ts

@@ -1,13 +0,0 @@
-import type { ModuleLoader } from '../core/module-loader/index.js';
-interface ImportedStyle {
-    id: string;
-    url: string;
-    content: string;
-}
-/** Given a filePath URL, crawl Vite’s module graph to find all style imports. */
-export declare function getStylesForURL(filePath: URL, loader: ModuleLoader): Promise<{
-    urls: Set<string>;
-    styles: ImportedStyle[];
-    crawledFiles: Set<string>;
-}>;
-export {};