♻️ 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/detect-libc/index.d.ts

@@ -1,14 +0,0 @@
-// Copyright 2017 Lovell Fuller and others.
-// SPDX-License-Identifier: Apache-2.0
-
-export const GLIBC: 'glibc';
-export const MUSL: 'musl';
-
-export function family(): Promise<string | null>;
-export function familySync(): string | null;
-
-export function isNonGlibcLinux(): Promise<boolean>;
-export function isNonGlibcLinuxSync(): boolean;
-
-export function version(): Promise<string | null>;
-export function versionSync(): string | null;