♻️ 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-astro/query.d.ts

@@ -1,15 +0,0 @@
-interface AstroQuery {
-    astro?: boolean;
-    src?: boolean;
-    type?: 'script' | 'template' | 'style' | 'custom';
-    index?: number;
-    lang?: string;
-    raw?: boolean;
-    inline?: boolean;
-}
-interface ParsedRequestResult {
-    filename: string;
-    query: AstroQuery;
-}
-export declare function parseAstroRequest(id: string): ParsedRequestResult;
-export {};