♻️ 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/astro/dist/preferences/defaults.js

@@ -1,18 +0,0 @@
-const DEFAULT_PREFERENCES = {
-  devToolbar: {
-    /** Specifies whether the user has the Dev Overlay enabled */
-    enabled: true
-  },
-  checkUpdates: {
-    /** Specifies whether the user has the update check enabled */
-    enabled: true
-  },
-  // Temporary variables that shouldn't be exposed to the users in the CLI, but are still useful to store in preferences
-  _variables: {
-    /** Time since last update check */
-    lastUpdateCheck: 0
-  }
-};
-export {
-  DEFAULT_PREFERENCES
-};