♻️ 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/lib/filesystem.js

@@ -1,51 +0,0 @@
-// Copyright 2017 Lovell Fuller and others.
-// SPDX-License-Identifier: Apache-2.0
-
-'use strict';
-
-const fs = require('fs');
-
-const LDD_PATH = '/usr/bin/ldd';
-const SELF_PATH = '/proc/self/exe';
-const MAX_LENGTH = 2048;
-
-/**
- * Read the content of a file synchronous
- *
- * @param {string} path
- * @returns {Buffer}
- */
-const readFileSync = (path) => {
-  const fd = fs.openSync(path, 'r');
-  const buffer = Buffer.alloc(MAX_LENGTH);
-  const bytesRead = fs.readSync(fd, buffer, 0, MAX_LENGTH, 0);
-  fs.close(fd, () => {});
-  return buffer.subarray(0, bytesRead);
-};
-
-/**
- * Read the content of a file
- *
- * @param {string} path
- * @returns {Promise<Buffer>}
- */
-const readFile = (path) => new Promise((resolve, reject) => {
-  fs.open(path, 'r', (err, fd) => {
-    if (err) {
-      reject(err);
-    } else {
-      const buffer = Buffer.alloc(MAX_LENGTH);
-      fs.read(fd, buffer, 0, MAX_LENGTH, 0, (_, bytesRead) => {
-        resolve(buffer.subarray(0, bytesRead));
-        fs.close(fd, () => {});
-      });
-    }
-  });
-});
-
-module.exports = {
-  LDD_PATH,
-  SELF_PATH,
-  readFileSync,
-  readFile
-};