♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/dist/assets/services/sharp.d.ts

@@ -1,14 +0,0 @@
-import type { ResizeOptions, SharpOptions } from 'sharp';
-import { type LocalImageService } from './service.js';
-export interface SharpImageServiceConfig {
-    /**
-     * The `limitInputPixels` option passed to Sharp. See https://sharp.pixelplumbing.com/api-constructor for more information
-     */
-    limitInputPixels?: SharpOptions['limitInputPixels'];
-    /**
-     * The `kernel` option is passed to resize calls. See https://sharp.pixelplumbing.com/api-resize/ for more information
-     */
-    kernel?: ResizeOptions['kernel'];
-}
-declare const sharpService: LocalImageService<SharpImageServiceConfig>;
-export default sharpService;