♻️ 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/elf.js

@@ -1,39 +0,0 @@
-// Copyright 2017 Lovell Fuller and others.
-// SPDX-License-Identifier: Apache-2.0
-
-'use strict';
-
-const interpreterPath = (elf) => {
-  if (elf.length < 64) {
-    return null;
-  }
-  if (elf.readUInt32BE(0) !== 0x7F454C46) {
-    // Unexpected magic bytes
-    return null;
-  }
-  if (elf.readUInt8(4) !== 2) {
-    // Not a 64-bit ELF
-    return null;
-  }
-  if (elf.readUInt8(5) !== 1) {
-    // Not little-endian
-    return null;
-  }
-  const offset = elf.readUInt32LE(32);
-  const size = elf.readUInt16LE(54);
-  const count = elf.readUInt16LE(56);
-  for (let i = 0; i < count; i++) {
-    const headerOffset = offset + (i * size);
-    const type = elf.readUInt32LE(headerOffset);
-    if (type === 3) {
-      const fileOffset = elf.readUInt32LE(headerOffset + 8);
-      const fileSize = elf.readUInt32LE(headerOffset + 32);
-      return elf.subarray(fileOffset, fileOffset + fileSize).toString().replace(/\0.*$/g, '');
-    }
-  }
-  return null;
-};
-
-module.exports = {
-  interpreterPath
-};