♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

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

dealplustech-astro/node_modules/postcss/lib/declaration.js

@@ -1,24 +0,0 @@
-'use strict'
-
-let Node = require('./node')
-
-class Declaration extends Node {
-  get variable() {
-    return this.prop.startsWith('--') || this.prop[0] === '$'
-  }
-
-  constructor(defaults) {
-    if (
-      defaults &&
-      typeof defaults.value !== 'undefined' &&
-      typeof defaults.value !== 'string'
-    ) {
-      defaults = { ...defaults, value: String(defaults.value) }
-    }
-    super(defaults)
-    this.type = 'decl'
-  }
-}
-
-module.exports = Declaration
-Declaration.default = Declaration