♻️ 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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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/sharp/install/check.js

@@ -1,14 +0,0 @@
-/*!
-  Copyright 2013 Lovell Fuller and others.
-  SPDX-License-Identifier: Apache-2.0
-*/
-
-try {
-  const { useGlobalLibvips } = require('../lib/libvips');
-  if (useGlobalLibvips() || process.env.npm_config_build_from_source) {
-    process.exit(1);
-  }
-} catch (err) {
-  const summary = err.message.split(/\n/).slice(0, 1);
-  console.log(`sharp: skipping install check: ${summary}`);
-}