♻️ 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/env/vite-plugin-env.d.ts

@@ -1,10 +0,0 @@
-import type { Plugin } from 'vite';
-import type { AstroSettings } from '../types/astro.js';
-import type { EnvLoader } from './env-loader.js';
-interface AstroEnvPluginParams {
-    settings: AstroSettings;
-    sync: boolean;
-    envLoader: EnvLoader;
-}
-export declare function astroEnv({ settings, sync, envLoader }: AstroEnvPluginParams): Plugin;
-export {};