♻️ 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/which-pm-runs/index.js

@@ -1,18 +0,0 @@
-'use strict'
-
-module.exports = function () {
-  if (!process.env.npm_config_user_agent) {
-    return undefined
-  }
-  return pmFromUserAgent(process.env.npm_config_user_agent)
-}
-
-function pmFromUserAgent (userAgent) {
-  const pmSpec = userAgent.split(' ')[0]
-  const separatorPos = pmSpec.lastIndexOf('/')
-  const name = pmSpec.substring(0, separatorPos)
-  return {
-    name: name === 'npminstall' ? 'cnpm' : name,
-    version: pmSpec.substring(separatorPos + 1)
-  }
-}