♻️ 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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✅ 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/vite-plugin-integrations-container/index.d.ts

@@ -1,8 +0,0 @@
-import type { Plugin as VitePlugin } from 'vite';
-import type { Logger } from '../core/logger/core.js';
-import type { AstroSettings } from '../types/astro.js';
-/** Connect Astro integrations into Vite, as needed. */
-export default function astroIntegrationsContainerPlugin({ settings, logger, }: {
-    settings: AstroSettings;
-    logger: Logger;
-}): VitePlugin;