♻️ 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

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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/@astrojs/internal-helpers/dist/fs.d.ts

@@ -1,15 +0,0 @@
-import type { PathLike } from 'node:fs';
-export declare function writeJson<T>(path: PathLike, data: T): Promise<void>;
-export declare function removeDir(dir: PathLike): Promise<void>;
-export declare function emptyDir(dir: PathLike): Promise<void>;
-export declare function getFilesFromFolder(dir: URL): Promise<URL[]>;
-/**
- * Copies files into a folder keeping the folder structure intact.
- * The resulting file tree will start at the common ancestor.
- *
- * @param {URL[]} files A list of files to copy (absolute path).
- * @param {URL} outDir Destination folder where to copy the files to (absolute path).
- * @param {URL[]} [exclude] A list of files to exclude (absolute path).
- * @returns {Promise<string>} The common ancestor of the copied files.
- */
-export declare function copyFilesToFolder(files: URL[], outDir: URL, exclude?: URL[]): Promise<string>;