♻️ 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/vite-plugin-utils/index.d.ts

@@ -1,20 +0,0 @@
-import type { AstroConfig } from '../types/public/config.js';
-export declare function getFileInfo(id: string, config: AstroConfig): {
-    fileId: string;
-    fileUrl: string | undefined;
-};
-/**
- * Normalizes different file names like:
- *
- * - /@fs/home/user/project/src/pages/index.astro
- * - /src/pages/index.astro
- *
- * as absolute file paths with forward slashes.
- */
-export declare function normalizeFilename(filename: string, root: URL): string;
-export declare function cleanUrl(url: string): string;
-/**
- * Detect `?url`, `?raw`, and `?direct`, in which case we usually want to skip
- * transforming any code with this queries as Vite will handle it directly.
- */
-export declare function hasSpecialQueries(id: string): boolean;