♻️ 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

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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/cli/exec.d.ts

@@ -1,6 +0,0 @@
-import { type Options } from 'tinyexec';
-/**
- * Improve tinyexec error logging and set `throwOnError` to `true` by default
- * @deprecated use CommandExecutor instead
- */
-export declare function exec(command: string, args?: string[], options?: Partial<Options>): PromiseLike<import("tinyexec").Output>;