♻️ 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
✅ Cookie consent banner included
✅ 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/content/index.d.ts

@@ -1,6 +0,0 @@
-export { attachContentServerListeners } from './server-listeners.js';
-export { createContentTypesGenerator } from './types-generator.js';
-export { getContentPaths, hasAssetPropagationFlag } from './utils.js';
-export { astroContentAssetPropagationPlugin } from './vite-plugin-content-assets.js';
-export { astroContentImportPlugin } from './vite-plugin-content-imports.js';
-export { astroContentVirtualModPlugin } from './vite-plugin-content-virtual-mod.js';